Catalyst for preparing phosgene and method for preparing phosgene using the same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C07C-051/58
C01B-031/28
B01J-027/224
B01J-021/18
B01J-035/00
B01J-035/02
B01J-037/02
B01J-037/08
출원번호
US-0904138
(2014-02-11)
등록번호
US-9399582
(2016-07-26)
우선권정보
CN-2013 1 0375888 (2013-08-26)
국제출원번호
PCT/CN2014/071969
(2014-02-11)
국제공개번호
WO2015/027686
(2015-03-05)
발명자
/ 주소
Chen, Bin
Luo, Wuxi
Yao, Yu
Shao, Liangfeng
Wang, Lei
Zhang, Hongke
Hua, Weiqi
출원인 / 주소
Wanhua Chemical (Ningbo) Co., Ltd.
대리인 / 주소
Buchanan Ingersoll & Rooney PC
인용정보
피인용 횟수 :
0인용 특허 :
3
초록▼
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 d
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.
대표청구항▼
1. A catalyst for preparing phosgene, wherein said catalyst is an alkali metal salt-modified activated carbon coating/foamed silicon carbide structural catalyst, and the activated carbon coating has the thickness of 0˜800 μm, preferably 0.1 ˜300 μm. 2. The catalyst according to claim 1, wherein: the
1. A catalyst for preparing phosgene, wherein said catalyst is an alkali metal salt-modified activated carbon coating/foamed silicon carbide structural catalyst, and the activated carbon coating has the thickness of 0˜800 μm, preferably 0.1 ˜300 μm. 2. The catalyst according to claim 1, wherein: the amount of said alkali metal salt is 0.01˜100 g/L, preferably 0.3˜30 g/L, based on the volume of the catalyst. 3. The catalyst according to claim 2, wherein: said alkali metal salt is one or more selected from chlorides, nitrates and sulfates, preferably sodium chloride and/or potassium chloride. 4. A method for preparing the catalyst of claim 1, wherein: immersing the activated carbon coating/foamed silicon carbide structural catalyst in 0.5˜2 mol/L, preferably 0.8˜1.5 mol/L of the aqueous solution of the alkali metal salt, taking the catalyst out and drying; calcining the dried catalyst at 400˜500° C. for 1˜2 hours under nitrogen atmosphere, thereby obtaining the alkali metal salt-modified activated carbon coating/foamed silicon carbide structural catalyst. 5. A method for preparing phosgene by using the catalyst of claim 1 or the catalyst obtained by the method of claim 4, wherein: carbon monoxide and chlorine gas are reacted in the multi-tubular reactor of a fixed bed packed with the catalyst, wherein the catalyst is packed in the multi-tubular reactor of the fixed bed in section, thus divides the multi-tubular reactor of the fixed bed, from bottom to top of the reactor in the axial direction of it, as: a reaction initiation section (1), a rapid reaction section (2), a smooth transition section (3), and an outlet temperature decreasing section (4); wherein,the length of said reaction initiation section (1) is 10˜20% of the total length of the tube(s), and in the reaction initiation section (1), the thickness of the activated carbon coating is 0˜300 μm, preferably 50˜200 μm, and the amount of the alkali metal salt is 0.1˜5 g/L, preferably 0.3˜1 g/L, based on the volume of the catalyst;the length of said rapid reaction section (2) is 10˜20% of the total length of the tube(s), and in the rapid reaction section (2), the thickness of the activated carbon coating is 0˜100 μm, preferably 0˜50 μm, and the amount of the alkali metal salt is 10˜30 g/L, preferably 20˜30 g/L, based on the volume of the catalyst;the length of said smooth transition section (3) is 40˜50% of the total length of the tube(s), and in the smooth transition section (3), the thickness of the activated carbon coating is 50˜300 μm, preferably 100˜200 μm, and the amount of the alkali metal salt is 5˜20 g/L, preferably 5˜15 g/L, based on the volume of the catalyst;the length of said outlet temperature decreasing section (4) is 20˜30% of the total length of the tube(s), and in the outlet temperature decreasing section (4), the thickness of the activated carbon coating is 0˜300 μm, preferably 50˜100 μm, and the amount of the alkali metal salt is 0.5˜10 g/L, preferably 1˜5 g/L, based on the volume of the catalyst. 6. The method according to claim 5, wherein: the volume ratio of carbon monoxide and chlorine gas is 1˜1.05:1. 7. The method according to claim 5, wherein: the reaction pressure is 0˜0.4 MPa, preferably 0.1˜0.35 MPa. 8. The method according to claim 5, wherein: the heat transfer medium of the multi-tubular reactor of the fixed bed is boiling water, carbon tetrachloride, chlorobenzene, ortho-dichlorobenzene or toluene, preferably boiling water. 9. The method according to claim 5, wherein: the radial temperature difference in the multi-tubular reactor of the fixed bed is <200° C., the temperature of the hot spot is <500° C., the height of the part having the reaction temperature in the range of 400˜500° C. in the axial direction of the tube(s) is 40% or more of the total axial height of the tube(s), and the height of the part having the reaction temperature in the range of 250˜500° C. in the axial direction of the tube(s) is 90% or more of the total axial height of the tube(s).
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이 특허에 인용된 특허 (3)
Obrecht Robert P. (Orinda CA), Phosgene manufacture.
Sauer Heinz (Odenthal TX DEX) Porkert Helmut F. (Baytown TX) Liebsch Dietrich (Leverkusen DEX), Process for the production of phosgene with simultaneous generation of steam.
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