Wanhua Chemical Group Co., Ltd.

Wanhua Chemical (ningbo) Co., Ltd.

Wanhua Chemical Co., Ltd.

Yuan Li

Weiqi Hua

Yonghua Shang

Hao Chen

Qingmei Jiang

Naibo Chu

Changsheng Chen

Bin Shi

Lei Wang

Congying Zhang

Jinhong Song

Tongji Wang

Fei Ye

Xin Li

Zhenguo Liu

Jiaoying Cui

Hengdong Yang

Jianglin Hu

Yunhai Liu

Wenbin Li

Ke Ding

Wei Zeng

Lichao Yang

Lei Tang

Wei Liu

Yang Yang

Guangquan Yi

Zhongying Chen

Kun Wang

Zaigang Yang

Yuqi Wang

Shujie Ren

Xiaolong Wang

Zhipeng Liu

Hao Ding

Yanfang Song

Wenjuan Zhao

Kang Sun

Jingxu Wang

Bingbo Hu

Nuancheng Wang

Zhicheng Zhu

Bin Liu

Jian Wu

Jiansheng Ding

Qiang Li

Jing Li

Peng Wang

Hui Wang

Fuguo Li

Changxun Ju

Shuchang Sun

Bing Zheng

Cong Wang

Li Li

Jie Chen

Qiao Wang

Jing Dong

Ye Sun

Yong Yu

Xueli Yu

Xuelei Cui

Lidong Sun

Lei Yu

Zilin Ni

Junping Li

Haibo Chen

Lichang Zhang

Chunxian Cui

Yuanye Bao

Junhua Zhang

Zhaokun Cheng

Haijun Li

Ensen Ma

Zhanyu Gao

Biao Wang

Jinke Jiang

Jing Wang

Chengge Lv

Shan Gao

Weijia Wang

Hongyin Cui

Zuojin Li

Haibo Yu

Xinjian Bian

Jishan Zhan

Ningning Wang

Tonghe Li

Jinping Han

Yu Sha

Qiankun Jiao

Pengfei Wang

Lei Qin

Ruihua Cheng

Baiping Liu

Hua Mei

Dewei Yu

Shanjian Cao

The present application provides a storage-stable polyisocyanate composition and a preparation method. The polyisocyanate composition is obtained by selecting one or more diisocyanate from aliphatic diisocyanates and alicyclic diisocyanates, and reacting same with an alcohol compound; the polyisocyanate composition contains an isocyanurate group, a uretdione group, a carbamate group, and an allophanate group; within the polyisocyanate composition, the molar ratio of the carbamate group/(uretdione group+isocyanurate group) is 0.01-0.2, and preferably 0.01-0.1. Compared to existing techniques, the present application has the advantage of a noticeable increase in system viscosity of uretdione polyisocyanate during storage. With the present application, by means of controlling the ratio of the carbamate group/(uretdione group+isocyanurate group) within the system, the increase in viscosity of a product during storage is inhibited, thereby improving the storage stability of the product.

Storage-stable polyisocyanate composition and preparation method

Disclosed is a 1,3-bisisocyanatomethylcyclohexane composition and an optical resin prepared therefrom. The composition comprises, based on the weight of 1,3-bisisocyanatomethylcyclohexane, a) 65%-95 wt % of trans-1,3-bisisocyanatomethylcyclohexane; b) greater than 0 and less than or equal to 0.5 wt %, preferably 0.02-0.5 wt % of 1,4-bisisocyanatomethylcyclohexane. Preferably, the 1,3-bisisocyanatomethylcyclohexane composition contains greater than 0 and less than or equal to 600 ppm of 1-isocyanatomethyl-3-methylcyclohexane, based on the weight of 1,3-bisisocyanatomethylcyclohexane. The 1,3-bisisocyanatomethylcyclohexane composition is used for preparing an optical resin, which can be applied to produce an optical lens with a better performance in preventing opacification and optical distortion.

1,3-bisisocyanatomethylcyclohexane composition and optical resin prepared therefrom

A preparation method for optically active citronellal, which can obviously enhance the catalytic stability of an optically active transition metal catalyst for asymmetric hydrogenation of homogeneous catalysis and thereby achieve higher turnover numbers. In the preparation method for optically active citronellal, a substrate is subjected to an asymmetric hydrogenation reaction in the presence of the transition metal catalyst to generate the optically active citronellal, wherein the transition metal catalyst is obtained by reacting a transition metal compound with an optically active ligand containing two phosphorus atoms, and the raw material of the substrate is one of neral and geranial or a combination thereof to control the hydroxyl value to be less than or equal to 6 mgKOH/g and/or the iron content to be less than or equal to 50 ppm in the raw material of the substrate for the asymmetric hydrogenation reaction.

Preparation method for optically active citronellal

Disclosed by the present invention is a method for preparing a reactive sealant resin, the method comprising: (1) under the action of an alkali catalyst, polymerizing a hydroxyl-containing initiator with an epoxy compound to obtain a polyether polyol; (2) adding an alkoxide reagent and a halogenated end-capping agent containing a double bond to the polyether polyol obtained in step (1) for reaction, so as to obtain a crude double-bonded polyether product, and refining the crude product to obtain a modified polyether product; and (3) subjecting the modified polyether and hydrogen-containing silane to silane end-capping reaction under the action of a hydrosilylation catalyst, so as to obtain the target product, i.e., a reactive sealant resin. The resin has excellent properties as well as good adhesion and paintability.

Method for preparing reactive sealant resin

Preparation method for a polyurethane optical resin and applications thereof. The preparation method for the polyurethane optical resin comprises: a raw material composition comprising isocyanate and a polythiol compound undergoes a polymerization to produce the polyurethane optical resin. The turbidity value of the isocyanate used in the raw material composition is controlled at ≤2 NTU. The polyurethane optical resin produced is applicable in manufacturing optical products.

Preparation method for polyurethane optical resin and applications thereof

A method for preparing isophorone diisocyanate by (1) reacting isophorone with hydrogen cyanide in the presence of a catalyst to obtain isophorone nitrile; (2) reacting the isophorone nitrile obtained in step (1) with ammonia gas and hydrogen in the presence of a catalyst to obtain isophorone diamine; and (3) subjecting the isophorone diamine to a phosgenation reaction to obtain the isophorone diisocyanate, wherein the content of impurities containing a secondary amine group in the isophorone diamine that undergoes the phosgenation reaction in step (3) is ≤0.5 wt. The method reduces the content of hydrolyzed chlorine in the isophorone diisocyanate product, improves the yellowing resistance of the product, and the harm due to presence of hydrolyzed chlorine in the product is reduced.

Method for preparing isophorone diisocyanate

Provided are a preparation method for a propylene epoxidation catalyst, and a use thereof. During the preparation, an alkoxide solution of a prepared active component and a silica gel support are mixed, then a rotary evaporation treatment is performed on the mixture to remove a low-carbon alcohol to obtain a catalyst precursor, and then the obtained catalyst precursor is subjected to calcination and silylation treatments to obtain the propylene epoxidation catalyst. The catalyst is prepared in a simple process, can be applied to the chemical process of preparing propylene oxide by propylene epoxidation, has high average selectivity to propylene oxide, and has industrial application prospect.

Preparation method for propylene epoxidation catalyst and use thereof

A method for preparing an isocyanate in a gaseous phase by feeding, in the presence or absence of an inert gas, an amine-containing gas stream and a phosgene-containing gas stream into a reaction region, allowing the amine and the phosgene to contact in gaseous forms and undergo a phosgenation reaction in the reaction region, thus preparing the target isocyanate in a gaseous form in the reaction region. The phosgene-containing stream is subjected to preheating and warming before being fed into the reaction region, and the phosgene-containing stream comprises a substance A at a mass fraction of &#x3c;1% before being subjected to the preheating and warming up. Substance A is a NCO group-containing substance and/or an olefinic double bond-containing substance. The method reduces the formation of clogging matter in a heat exchanger and a vessel during the preheating and warming of the phosgene and during the reaction process.

Method for preparing isocyanate in gaseous phase

The present invention relates to a preparation method for an olefin epoxidation catalyst, comprising: (1) preparing a titanium-silicon gel; (2) performing pore-enlarging treatment to the titanium-silicon gel by using organic amine or liquid ammonia, and drying, calcinating to obtain a titanium-silicon composite oxide; (3) optionally performing alcohol solution of organic alkali metal salt treatment; and (4) optionally performing gas-phase silanization treatment. The catalyst prepared by the method of the present invention has adjustable variability for pore size, so that the activity thereof for epoxidation reactions of the olefin molecules with different dynamic diameters is higher; the surface acidity of the catalyst can be reduced effectively through two-step modification to the catalyst, so that the catalyst has higher selectivity for epoxidation product.

Olefin epoxidation catalyst, preparation method therefor, and application thereof

Disclosed is a method for preparing &#x3b2;-phenylethanol. The method comprises the following steps: (1) reducing a catalyst in a reactor in advance; (2) introducing pre-heated hydrogen gas to warm the reactor to a predetermined temperature; and (3) introducing a raw material styrene oxide to perform a hydrogenation reaction so as to obtain the &#x3b2;-phenylethanol. The catalyst is Ni&#x2014;Cu/AlOnanosized self-assembled catalyst. The reactor is an ultrasonic field micro-packed bed reactor. The method of the present invention enables the selectivity of the &#x3b2;-phenylethanol to reach 99% or more.

Reaction system, catalyst and method for preparing &#x3b2;-phenylethanol

A preparation method for a propylene epoxidation catalyst: pre-hydrolyzing a silicon source, adding a titanium source and reacting to form a sol, atomizing the sol and then spraying it into liquid ammonia for molding, implementing pore broadening, and performing drying, calcination, and silanization treatment to obtain a Ti&#x2014;SiOcomposite oxide catalyst. The present catalyst can be used in the chemical process of preparing propylene oxide by epoxidation of propylene, the average propylene oxide selectivity being up to 97.5%, having prospects for industrial application.

Preparation method for propylene epoxidation catalyst, and application thereof

Disclosed in the present invention are a preparation method for an olefin epoxidation catalyst and applications thereof. The method comprises: loading an auxiliary metal salt onto a silica gel carrier, and carrying out a drying treatment to the silica gel carrier; loading a titanium salt (preferably TiCl) onto the silica gel carrier by a chemical vapor deposition method; calcining to obtain a silica gel on which the auxiliary metal oxide and Ti species are loaded; obtaining an catalyst precursor (Ti-MeO&#x2014;SiOcomposite oxide) by water vapor washing; loading alkyl silicate (preferably tetraethyl orthosilicate) onto the surface of the catalyst precursor by a chemical vapor deposition method and calcining the catalyst precursor to obtain a Ti-MeO&#x2014;SiOcomposite oxide with the surface coated with a SiOlayer; and carrying out a silylanization treatment to obtain the catalyst. The catalyst can be applied to a chemical process of propylene epoxidation to prepare propylene oxide, and has an average selectivity to PO up to 96.7%, the method of the present invention and the applications thereof have industrial application prospects.

Preparation method for olefin epoxidation catalyst and applications thereof

Disclosed is catalyst preparation method for liquid phase hydrogenation of acetophenone in preparation of &#x3b1;-phenylethanol. The method includes adding water, small alcohol, Gemini surfactant and organic pore-forming agent to reactor. Then adding silica sol and stirring to prepare aqueous dispersion of silica sol; preparing alkaline precipitant and mixed solution containing salts of copper containing compound, zinc containing compound, rare-earth metal containing compound and alkaline-earth metal containing compound, adding alkaline precipitant and mixed solution together to aqueous dispersion, followed by precipitation, ageing, filtration, washing, drying, calcination and molding to obtain catalyst. By using silica sol and silicate as composite silicon source, adding organic pore-forming agent before precipitation process, modifying catalyst by Zn, rare-earth metal and alkaline earth metal, when using liquid phase hydrogenation of acetophenone to prepare &#x3b1;-phenylethanol, catalyst has high activity and good selectivity, and effectively improves the catalyst's liquid resistance, has high strength and good stability.

Catalyst for preparing &#x3b1;-phenylethanol by hydrogenation of acetophenone, preparation method thereof and application thereof

An isocyanate polymerization catalyst, a preparation method thereof and a method for preparing polyisocyanates comprising isocyanurate groups by using the same. The catalyst is a carboxylic acid salt containing a di-quaternary ammonium ion. The structure of the catalyst contains hydroxyl-containing aromatic heterocyclic residues. The catalyst is highly active. Only a small quantity of the catalyst is required for the polymerization of isocyanates. The prepared polyisocyanates have color values lower than 25 Hazen, monomer contents of less than 0.5% by weight, high contents of isocyanurates and low viscosities.

Isocyanate polymerization catalyst, preparation method thereof, and method for preparing polyisocyanate by using same

Disclosed is an imine-type quaternary ammonium salt catalyst, wherein the catalyst has a general structure formula shown by formula I below; in the formula, R1 and R2, respectively, are independently selected from a C1-C20 linear alkyl or a branched C3-C20 alkyl, and a C1-C20 hydroxylalkyl, a C3-C8 cycloalkyl, and arylated alkyl; R3 is a linear or branched alkyl, cycloalkyl or aryl; and R4 is hydrogen, aryl, a linear C1-C15 alkyl or branched C3-C15 alkyl. Also disclosed are a method for preparing the catalyst and a polyisocyanate composition prepared therefrom. The catalyst, by introducing an imine structure, on the basis of ensuring high catalytic activity thereof, is allowed to have properties of high temperature decomposition and inactivation, and when applied to the synthesis of polyisocyanate, can effectively prevent the risk of explosive polymerization caused by an uncontrolled reaction.

Imine-type quaternary ammonium salt catalyst, preparation method thereof and use thereof for preparation of polyisocyanate composition

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Shandong, China

Yuan Li