Chinese Academy of Sciences

Wanhua Chemical Group Co., Ltd.

Wanhua Chemical (ningbo) Co., Ltd.

Wanhua Chemical Co., Ltd.

Bin Chen

Weiqi Hua

Hongke Zhang

Jiansheng Ding

Yu Yao

Lei Wang

Xuequan Zhang

Song Chen

Dongke Zhao

Dan Xu

Wuxi Luo

Hongguang Cai

Chunyu Zhang

Weimin Dong

Liangfeng Shao

Yang Wang

Keng H Chung

Qile Shi

Xuebing Li

Yuping Yuan

Guangci Li

Qiaofeng Zhang

Dekai Shi

Qinglong Chen

Kunpeng Zhang

A method for the regeneration of used lubricating oils to produce lubricant base oils includes the steps of (a) removing resin and impurities by distillation, (b) catalytic oxidation treatment and (c) adsorption process. The method can efficiently reduce the color, metal ions, and sulfur content under mild reaction conditions at low cost and obtain high yield of regenerated oil above 85 wt. %.

Method for regeneration of used lubricating oils

A solvent refining method for isocyanate prepared by the phosgene method and multistage absorbing towers used in same. Solvent to be refined which contains water, iron, and/or phosgene, hydrogen chloride and other materials with color is dealt by the present method and multistage absorbing towers, which can effectively prevent a drying agent from absorbing water and hardening, partial overheating in the tower and generating channeling. Meanwhile, the pressure drop is effectively lowered. In addition, the content of water is &#x2266;50 ppm, the content of iron is &#x2266;5 ppm, the content of phosgene and hydrogen chloride is &#x2266;20 ppm, Pt&#x2014;Co chroma is &#x2266;20 in the refined solvent. Therefore, the refined solvent can be used as the solvent for preparing isocyanate in the phosgene method and remarkably improve an L color of isocyanate.

Solvent refining method for isocyanate prepared by phosgene method and devices used in same

The present invention relates to a catalyst for preparing phosgene and a method for preparing phosgene using the catalyst. Said method comprises: modifying the surface of an activated carbon coating/foamed silicon carbide structural catalyst using an alkali metal salt; filling the catalysts having different thickness of the activated carbon coating and different amount of the alkali metal salt in different sections in the axial direction of the multi-tubular reactor of the fixed bed, and preparing phosgene using Cland CO. The radial and axial temperature difference of the catalyst bed is lowered by using the alkali metal salt-modified activated carbon coating/foamed silicon carbide structural catalyst and by segmental filling, so that high temperature of tube wall is obtained in the case of a larger tube diameter, and high quality of steam is obtained stably.

Catalyst for preparing phosgene and method for preparing phosgene using the same

The present invention relates to a catalyst for synthesizing a polypropylene with a wide molecular weight distribution and use of the same. The catalyst comprises magnesium halide, titanium-containing compound, and an organic phosphate type electron donor compound. By the catalyst according to the present invention, a propylene polymer with a wide molecular weight distribution, easily controllable isotacticity and good processing properties can be synthesized.

Catalysts for synthesizing a polypropylene with a wide molecular weight distribution and use of the same

Growing community of inventors

Shandong, China

Bin Chen