Zhejiang University

Zhejiang Nhu Company Ltd.

Shandong Nhu Pharmaceutical Co., Ltd.

Zhejiang Nhu Special Materials Co., Ltd.

Zhejiang Xinsheng Electronic Technology Co., Ltd.

Shandong Nhu Vitamin Co., Ltd.

Shangyu Nhu Biological Chemical Co., Ltd.

Shandong Nhu Amino Acid Co., Ltd.

Shandong Nhu Fine Chemical Science and Technology Company Ltd.

Zhejiang Nhd Company Ltd.

Zhejiang Nhu Nylon Materials Co., Ltd.

Haoran Li

Zhirong Chen

Yong Wang

Shanjun Mao

Lili Yu

Xiao Ma

Jianyong Mao

Baishan Hu

Qichuan Li

Zhe Wang

Hong Yin

Dan Qiu

Genqiang Cui

Bingyun Lyu

Yougui Zhou

Ming Yu

Ming Lian

Woyuan Li

Lei Zhao

Guiyang Zhou

Yong Xu

Gang Chen

Qing Liu

Yin Zhang

Yu Wang

Weikang Shao

Yuhong Zhang

Jintao Yuan

Yu Ding

Ming Feng

Jingsi Tang

Xiandong Zhu

Guangxiong Yu

Xinfeng Zheng

Weiwei Su

Xingxing Shi

Wenwu Yan

Guíyang Zhou

Shuaifeng Pan

Guangde Qin

Guanbing Li

Yingkuo Yang

Jiyu Tang

Weiyong Chen

Qian Luo

Bing Lu

Fuxiang Deng

Wei Xue

Sheng Yu

Jianqing Li

Guodong Huang

Wenbin Wu

Litao Zhou

Keyan Wang

Yu Sheng

The present disclosure relates to a system and method. The system includes: a storage device storing a set of instructions; and one or more processors in communication with the storage device. When executing the set of instructions, the one or more video processors: synchronize a signal with a first PN sequence, wherein the signal includes a plurality of second PN sequences, marked as 0 PN sequence, 1 PN sequence, . . . , (k&#x2212;1) PN sequence, k sequence, wherein k is a positive integer number; determine that the signal is synchronized with the first PN sequence; determine a first target distance between the (k&#x2212;1) PN sequence and the k sequence; and determine a formality standard of the signal based on the first target distance.

Systems and methods for identifying formality standard

The present disclosure discloses a preparation method for 4-phenylthio-benzenethiol. The preparation method comprises the following steps: subjecting phenyl sulfide as a raw material to a halogenation reaction to obtain 4-halophenyl sulfide; subjecting the 4-halophenyl sulfide to a sulfhydrylation reaction to obtain a 4-phenylthio-phenylthiolate; and subjecting the 4-phenylthio-phenylthiolate to acidification. The preparation method of the present disclosure avoids the use of materials such as thiophenol which pollutes the environment, and realizes efficient recycling of the reaction materials, solvents, water and the like. The preparation method of the present disclosure is a green process for the synthesis of 4-phenylthio-phenylthiol without organic waste, waste acid and waste water discharge.

Preparation method for 4-phenylthio-benzenethiol

The present disclosure relates to a method for preparing isophorone diamine by means of a hydrogenation reduction of isophorone nitrile imine. The hydrogenation reduction is continuously carried out in a multi-stage bubble column reactor loaded with a supported alkaline cobalt-based catalyst, wherein isophorone nitrile imine is successively in countercurrent contact with hydrogen in each stage of the reactor to carry out a hydrogenation reduction reaction, so as to obtain the isophorone diamine. The preparation method solves the problem of back-mixing, and further improves the conversion rate and the cis/trans ratio of the product.

Method for preparing isophorone diamine by means of hydrogenation reduction of isophorone nitrile imine

The present invention discloses a selective hydrogenation catalyst and a preparation method and an application thereof, belonging to the technical field of catalysts. The selective hydrogenation catalyst comprises an active component and a carrier for supporting the active component, wherein the active component is a transition metal particle, the carrier is modified by a flexible chain ligand in advance, one end of the flexible chain ligand is uniformly distributed on the surface of the carrier, and the other end of the flexible chain ligand is coordinated on a transition metal. When the catalyst is used for catalytic hydrogenation reaction of dehydrolinalool or 2-methyl-3-butyn-2-ol, the stability is good, the catalyst still has high selectivity after being used for a long time, and the quality of a hydrogenation product can be guaranteed.

Selective hydrogenation catalyst, preparation method and application thereof

The present disclosure belongs to the technical field of catalysis, and particularly relates to a metal oxide coated ceramic corrugated plate catalyst, its preparation method and application thereof in preparation of key intermediates of citral. The catalyst consists of a ceramic corrugated plate carrier and a metal oxide active layer coated on a surface of the carrier, wherein the metal oxide active layer is a metal oxide formed by active ingredient titanium and at least four other metal elements selected from vanadium, chromium, manganese, iron, zirconium, niobium and molybdenum.

Metal oxide coated ceramic corrugated plate catalyst, preparation and application in preparation of key intermediates of citral

The present invention discloses a method for preparing sucralose-6-acetate in a biphasic liquid-liquid system. The method comprises slowly dropwise adding an inert non-polar solvent containing a chlorinating agent to an N,N-dimethyl formamide (DMF) solution of sucrose-6-acetate; then reacting the biphasic liquid-liquid mixture at a certain temperature for 9-20 hours; cooling the system to room temperature after stopping heating, and settling the solution to form layers, an upper layer being an inert non-polar solvent layer, and a lower layer being a DMF solution layer containing the product; hydrolyzing, neutralizing, and filtering the lower layer to obtain a filtrate, and then concentrating the filtrate to obtain a concentrate; dissolving the concentrate in water, and obtaining the product by extraction using ethyl acetate and crystallization, the inert non-polar solvent being an alkane solvent containing 8-18 carbon atoms that is not mutually soluble with DMF. The method has a high product yield, and can significantly reduce the decomposition of DMF, thereby reducing costs.

Method for preparing sucralose-6-acetate in biphasic liquid-liquid system

The present disclosure provides a PdIn alloy catalyst including a carrier and Pd metal particles supported by the carrier, the carrier is a nitrogen-doped porous carbon composite material having a plurality of passages, Pd metal particles are distributed in the plurality of passages, the nitrogen-doped porous carbon composite material includes a nitrogen-doped porous carbon material, a plurality of indium oxide particles, and In metal particles. The In metal particles are exposed through the plurality of passages, the plurality of indium oxide particles are uniformly distributed in the nitrogen-doped porous carbon material, and In atoms of the In metal particles migrated to surfaces of Pd particles selectively occupy edge and corner positions of metal lattice of Pd metal particles. The present disclosure further provides a method for manufacturing the PdIn alloy catalyst and application thereof.

PdIn alloy catalyst, method for manufacturing PdIn alloy catalyst and application thereof

A composite catalyst includes a carrier and noble metal particles supported by the carrier, wherein the carrier is a nitrogen-doped porous carbon composite material having a plurality of passages. The nitrogen-doped porous carbon composite material can include a nitrogen-doped porous carbon material and a plurality of metal oxide particles. The plurality of metal oxide particles can be uniformly distributed in the nitrogen-doped porous carbon material. The plurality of metal oxide particles can be partially exposed through the plurality of passages. The noble metal particles can be tightly combined with the exposed metal oxide particles to achieve recombination. And the noble metal particles can be at least one of Pd metal particles, Pt metal particles, Ru metal particles, Rh metal particles, Ir metal particles, Au metal particles, or a combination thereof.

Composite catalyst, method for manufacturing composite catalyst and application thereof

The present invention discloses a method for preparing optically active carbonyl compound, comprising the following steps: under the catalysis of chiral amine salt and transition metal catalysts, with hydrogen and catalytic amount of dihydropyridine compound as hydrogen source, use &#x3b1;, &#x3b2;-unsaturated aldehydes or &#x3b1;, &#x3b2;-unsaturated troponoid compounds to conduct asymmetric catalytic reaction to obtain the optically active carbonyl compound. This method comes in moderate reaction condition, simple operation, and catalytic amount of dihydropyridine compounds usage, the target product is easy to be separated and purified from the reaction system, and the metal catalyst can be recycled, it is economical.

Method for preparing optically active carbonyl compound

The present invention discloses a fiber-grade polyphenylene sulfide resin synthesis method, taking sodium bisulfide and p-dichlorobenzene as raw materials, N-methyl pyrrolidone as the solvent and C5-C6 fatty acid salt formed through dehydration to C5-C6 fatty acid and sodium hydroxide as the polymerization additive for synthesis through polymerization. White polyphenylene sulfide resin is obtained through acidification and washing of reaction slurry. In view of the fact that MFR is below 125 g/10 min, weight-average molecular weight as measured by GPC is over 4.2&#xd7;10, and whiteness is over 90, it can satisfy requirements for fiber polyphenylene sulfide resin. C5-C6 fatty acid salt according to the method of the present invention has a higher solubility in NMP, which can better promote polymerization. It is to be fully diverted into the filtrate after filter prior to conversion into free fatty acid again through acidification with hydrochloric acid. C5-C6 fatty acid is available for azeotropy with water, which has a limited solubility in water. Therefore, it is applicable to recycle C5-C6 fatty acid from the filtrate through azeotropy with water, and thereby solve the problem with separation of additive and sodium chloride that are soluble in water.

Fiber grade polyphenylene sulfide resin synthesis method

Growing community of inventors

Hangzhou, China

Haoran Li