Process for purifying hydrogen chloride

• US 20110166369A1
• Filed: 09/11/2009
• Published: 07/07/2011
• Est. Priority Date: 09/12/2008
• Status: Active Grant

• Current Assignee: Solvay SA (Solvac SA)
• Original Assignee: Solvay SA (Solvac SA)
• Inventors: Gilbeau, Patrick, Krafft, Philippe
• Granted Patent: US 8,536,381 B2
• Time in Patent Office: Days
• US Class Current: 549/521
• CPC Class Codes: C01B 7/0706 of hydrogen chloride
• CPC Class Codes: C07D 301/26 Y being hydrogen
• CPC Class Codes: C08G 59/063 with epihalohydrins

Abstract

Process for purifying hydrogen chloride, comprising at least one step of bringing said hydrogen chloride into contact with a scrubbing agent containing at least one chlorohydrin.

Claims

1. - A process for purifying hydrogen chloride, comprising at least one step of bringing said hydrogen chloride into contact with a scrubbing agent containing at least one chlorohydrin.

2. - The process according to claim 1, wherein at least one portion of the hydrogen chloride is in the gaseous state.

3. - The process according to claim 1, wherein the hydrogen chloride contains aromatic organic compounds.

4. - The process according to claim 1, wherein the hydrogen chloride is the by-product of the manufacture of organic isocyanates.

5. - The process according to claim 4, wherein the hydrogen chloride is the by-product of the manufacture of organic isocyanates by reacting phosgene with an organic amine.

6. - The process according to claim 3, wherein the aromatic organic compounds are chloroaromatic compounds.

7. - The process according to claim 1, wherein the chlorohydrin is selected from the group consisting of monochloropropanediol, dichloropropanol, and mixtures thereof.

8. - The process according to claim 1, wherein the scrubbing agent additionally contains at least one compound selected from the group consisting of water, alcohols, aldehydes, ketones, carboxylic acids, carboxylic acid esters, ethers, halogenated hydrocarbons, epoxides, metals, and mixtures of at least two of them.

9. - The process according to claim 1, wherein the scrubbing agent is substantially composed of dichloropropanol in the liquid state.

10. - The process according to claim 1, wherein the step of bringing into contact with the scrubbing agent is carried out at a temperature between 10 and 120°

C., and at a pressure between 1 and 20 bar absolute.

11. - The process according to claim 1, wherein the flow of the scrubbing agent is between 0.5 and 50% by weight relative to the flow of hydrogen chloride to be purified.

12. - The process according to claim 1, wherein the hydrogen chloride is intended to be used in a reaction for the hydrochlorination of a polyhydroxylated aliphatic hydrocarbon.

13. - A process for manufacturing a chlorohydrin, comprising carrying out the process for purifying hydrogen chloride according to claim 1 in order to obtain purified hydrogen chloride, and reacting a polyhydroxylated aliphatic hydrocarbon, an ester of a polyhydroxylated aliphatic hydrocarbon or a mixture of the two with a chlorinating agent containing said purified hydrogen chloride in order to obtain the chlorohydrin.

14. - A process for manufacturing an epoxide, comprising carrying out the process for manufacturing a chlorohydrin according to claim 13 in order to obtain a chlorohydrin, and subjecting said chlorohydrin to a dehydrochlorination reaction.

15. - A process for manufacturing an epoxy derivative selected from the group consisting of epoxy resins, glycidyl ethers, glycidyl esters, glycidyl amides, glycidyl imides, glycidyl amines, products that can be used as coagulants, wet-strength resins, cationization agents, flame retardants, ingredients for detergents, epichlorohydrin elastomers, halogenated polyethers-polyols, monochloropropanediol, and any mixture of at least two of them, comprising:

carrying out the process according to claim 14, wherein the epoxide is epichlorohydrin, and

subjecting the epichlorohydrin

to a reaction with at least one compound selected from the group consisting of monoalcohols, monocarboxylic acids, polyols, polyamines, amino alcohols, polyimides, polyamides, polycarboxylic acids, ammonia, amines, polyaminoamides, polyimines, amine salts, phosphoric acid, phosphoric acid salts, phosphorus oxychlorides, phosphoric acid esters, phosphonic acids, esters of phosphonic acids, salts of phosphonic acids, phosphinic acids, esters of phosphinic acids, salts of phosphinic acids, phosphine oxides, phosphines, ethoxylated alcohols, alkylene or phenylene oxides, and mixtures of at least two of them, or

to a homopolymerization reaction, or

to a reaction of oligomerisation, of co-oligomerisation, of condensation, of dehydrochlorination and of hydrolysis, with water, or with a di- or polyhydroxylated compound which may optionally be halogenated and/or have ether oxide bonds and/or double bonds capable of being halogenated in a subsequent stage, or

to a reaction with water.