公开(公告)号：US09399582B2

公开(公告)日：2016-07-26

申请号：US14904138

申请日：2014-02-11

Applicant: WANHUA CHEMICAL GROUP CO., LTD. ,  WANHUA CHEMICAL (NINGBO) CO., LTD.

Inventor： Bin Chen ,  Wuxi Luo ,  Yu Yao ,  Liangfeng Shao ,  Lei Wang ,  Hongke Zhang ,  Weiqi Hua

IPC: C07C51/58 ,  C01B31/28 ,  B01J27/224 ,  B01J21/18 ,  B01J35/00 ,  B01J35/02 ,  B01J37/02 ,  B01J37/08

CPC classification number: C01B31/28 ,  B01J21/18 ,  B01J23/04 ,  B01J27/10 ,  B01J27/224 ,  B01J31/06 ,  B01J35/0006 ,  B01J35/023 ,  B01J35/04 ,  B01J37/0219 ,  B01J37/0236 ,  B01J37/08 ,  B01J37/084 ,  B01J37/24 ,  C01B32/80

Abstract: 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 Cl2 and 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.

Abstract translation: 本发明涉及一种用于制备光气的催化剂和一种使用该催化剂制备光气的方法。 所述方法包括：使用碱金属盐改性活性炭涂层/泡沫碳化硅结构催化剂的表面; 在固定床的多管式反应器的轴向不同部分填充不同厚度的活性炭涂层和不同量的碱金属盐的催化剂，并使用Cl2和CO制备光气，径向和轴向温度 通过使用碱金属盐改性的活性炭涂层/发泡碳化硅结构催化剂和通过分段填充来降低催化剂床的差异，使得在管径较大的情况下获得管壁的高温，并且质量高 的蒸汽得到稳定。

公开(公告)号：US09840462B2

公开(公告)日：2017-12-12

申请号：US15301132

申请日：2014-04-11

Applicant: Wanhua Chemical Group Co., Ltd.

Inventor： Hongke Zhang ,  Yu Yao ,  Dongke Zhao ,  Weiqi Hua ,  Bin Chen ,  Dekai Shi ,  Qinglong Chen ,  Dan Xu ,  Yang Wang ,  Qile Shi

IPC: C07C263/00 ,  C07C263/20 ,  C07C263/10 ,  B01D15/00 ,  B01D15/10

CPC classification number: C07C263/20 ,  B01D15/00 ,  B01D15/10 ,  C07C263/10 ,  C07C265/14

Abstract: 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 ≦50 ppm, the content of iron is ≦5 ppm, the content of phosgene and hydrogen chloride is ≦20 ppm, Pt—Co chroma is ≦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.

公开(公告)号：US20190337802A1

公开(公告)日：2019-11-07

申请号：US16449384

申请日：2019-06-22

Applicant: WANHUA CHEMICAL GROUP CO., LTD

Inventor： Jiansheng Ding ,  Wuxi Luo ,  Bin Chen ,  Kunpeng Zhang ,  Weiqi Hua

IPC: C01B7/04 ,  C01B7/07

Abstract: A process of producing chlorine gas by catalytic oxidation of hydrogen chloride including: incorporating an oxidizing agent such as ozone, hydrogen peroxide solution etc. into a gas stream of hydrogen chloride containing impurities, conducting oxidation pretreatment of the gas stream under the action of ultrasonic wave, such that the impurities contained in the gas stream are oxidized; where the gas stream obtained after the oxidation pretreatment is allowed to pass through a separating device, the oxidized impurities in the form of liquid and/or the oxidized impurities in the form of solid are removed from the gas stream so as to obtain a purified gas stream of hydrogen chloride, and thereafter the purified gas stream of hydrogen chloride is well mixed with a gas stream containing molecular oxygen, the resultant gas mixture is preheated to a reaction temperature, and then catalytically oxidized to produce chlorine gas.

公开(公告)号：US20170022152A1

公开(公告)日：2017-01-26

申请号：US15301132

申请日：2014-04-11

Applicant: Wanhua Chemical Group Co., Ltd.

Inventor： Hongke Zhang ,  Yu Yao ,  Dongke Zhao ,  Weiqi Hua ,  Bin Chen ,  Dekai Shi ,  Qinglong Chen ,  Dan Xu ,  Yang Wang ,  Qile Shi

IPC: C07C263/20 ,  B01D15/10

CPC classification number: C07C263/20 ,  B01D15/00 ,  B01D15/10 ,  C07C263/10 ,  C07C265/14

Abstract: 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 ≦50 ppm, the content of iron is ≦5 ppm, the content of phosgene and hydrogen chloride is ≦20 ppm, Pt—Co chroma is ≦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.

Abstract translation: 通过光气法制备的异氰酸酯的溶剂精制方法和用于其的多级吸收塔。 含有水，铁和/或光气，氯化氢和其他颜色的材料的精制溶剂通过本方法和多级吸收塔来处理，这可以有效地防止干燥剂吸收水和硬化，部分过热 塔和生成渠道。 同时，压降有效降低。 此外，水的含量≤50ppm，铁的含量≤5ppm，光气和氯化氢的含量≤20ppm，精制溶剂中的Pt-Co色度≤20。 因此，可以将精制溶剂用作光气法制备异氰酸酯的溶剂，并显着提高异氰酸酯的L色。