Carbon dioxide purification in ethylene glycol plants
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C01B-031/20
C01B-007/01
C01B-007/00
B01J-008/00
출원번호
US-0394737
(1999-09-13)
발명자
/ 주소
Ahmed Ijaz,SAX
Al-Jodai Abdulaziz M.,SAX
Al-Khamees Abdulmohsin M.,SAX
Al-Saif Shaker A.,SAX
출원인 / 주소
Saudi Basic Industries Corporation, SAX
대리인 / 주소
Kramer Levin Naftalis & Frankel LLP
인용정보
피인용 횟수 :
7인용 특허 :
8
초록▼
A process is provided for production of substantially pure carbon dioxide from a CO.sub.2 off-gas stream from an ethylene glycol plant. Water is condensed from an off-gas stream which contains unsaturated hydrocarbons, saturated hydrocarbons, chlorinated hydrocarbons, carbon dioxide and water. The d
A process is provided for production of substantially pure carbon dioxide from a CO.sub.2 off-gas stream from an ethylene glycol plant. Water is condensed from an off-gas stream which contains unsaturated hydrocarbons, saturated hydrocarbons, chlorinated hydrocarbons, carbon dioxide and water. The dewatered gas stream is subjected to catalytic oxidation in the presence of excess oxygen whereby the unsaturated hydrocarbons, saturated hydrocarbons and chlorinated hydrocarbons are oxidized producing an oxidation stream containing carbon dioxide, water and hydrochloric acid. The HCl is removed with an absorbent and substantially pure carbon dioxide is collected. The absorbent-contacted stream can be subjected to catalytic deoxidation in the presence of hydrogen to convert unoxidized oxygen introduced in the catalytic oxidation to water.
대표청구항▼
[ What is claimed is:] [1.]1. A process for production of substantially pure carbon dioxide from a CO.sub.2 off-gas stream from an ethylene glycol plant comprising unsaturated hydrocarbons, saturated hydrocarbons, chlorinated hydrocarbons, carbon dioxide and water, said process comprising:condensing
[ What is claimed is:] [1.]1. A process for production of substantially pure carbon dioxide from a CO.sub.2 off-gas stream from an ethylene glycol plant comprising unsaturated hydrocarbons, saturated hydrocarbons, chlorinated hydrocarbons, carbon dioxide and water, said process comprising:condensing out water initially present in the CO.sub.2 off-gas stream to produce a dewatered off-gas stream;subjecting the dewatered off-gas stream to catalytic oxidation in the presence of excess oxygen whereby said unsaturated hydrocarbons, saturated hydrocarbons and chlorinated hydrocarbons are oxidized producing an oxidation product stream comprising carbon dioxide, water and hydrochloric acid;contacting the oxidation product stream with HCl adsorbent to adsorb hydrochloric acid producing an adsorbent-contacted stream; andcollecting substantially pure carbon dioxide from the absorbent-contacted stream. [13.]13. A process for production of substantially pure carbon dioxide and substantially pure condensate water from a CO.sub.2 off-gas stream from a ethylene glycol plant, comprising unsaturated hydrocarbons, saturated hydrocarbons, chlorinated hydrocarbons, ethylene glycol, carbon dioxide and water, said process comprising:subjecting the CO.sub.2 off-gas stream to catalytic oxidation in the presence of excess oxygen whereby said unsaturated hydrocarbons, saturated hydrocarbons, chlorinated hydrocarbons and ethylene glycol are oxidized producing an oxidation product stream comprising carbon dioxide, water and hydrochloric acid;condensing water from the oxidation product stream to produce substantially pure water and a dewatered off-gas stream;contacting the dewatered off-gas stream with HCl absorbent to absorb hydrochloric acid producing an absorbent-contacted stream; andcollecting substantially pure carbon dioxide from the absorbent-contacted stream.14. The process of claim 13 wherein the absorbent-contacted stream is subjected to catalytic deoxidation in the presence of hydrogen to convert unoxidized oxygen introduced in the catalytic oxidation step to water.15. The process of claim 13 wherein the waste gas stream comprises one more members of the group consisting of methyl chloride, vinyl chloride, ethyl chloride, allyl chloride, ethylene dichloride, ethylene oxide, aldehydes, monoethylene glycol, methane, ethane and ethylene.16. The process of claim 13 wherein the catalytic oxidation is carried out in the presence of a noble metal oxidation catalyst.17. The process of claim 16 wherein the oxidation catalyst comprises noble metal on a support.18. The process of claim 17 wherein the noble metal comprises platinum.19. The process of claim 18 wherein the support comprises alumina.
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이 특허에 인용된 특허 (8)
Nguyen Pascaline H. ; Chen James M. ; Wan Chung-Zong ; Chen Shau-Lin Frank ; Hu Zhicheng, Catalytic compositions and methods for suppression of halogenation of organic compounds with oxidation products of halo.
Johnston Earnest L. (Clearwater KS), Low temperature catalytic oxidation of chlorinated compounds to recover chlorine values using chromium-impregnated suppo.
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