Aqueous composition containing a salt, manufacturing process and use

Abstract

Aqueous composition containing at least one salt in an amount of at least 30 g/kg of composition, of which the total organic carbon content is at least 1 μg of C/l and at most 5 g of C/l of composition and which contains at least one carboxylic acid.

1 . An electrolysis process, wherein an aqueous composition having a total organic carbon content of at least 1 μg of C/l and at most 5 g of C/l of composition and comprising at least one salt in an amount of at least 30 g/kg of composition and at least one carboxylic acid is used as a reactant in said process. 
     
     
         2 . The process according to  claim 1 , wherein the electrolysis process is carried out at a temperature higher than or equal to 0° C. and lower than or equal to 120° C. and at a pressure higher than or equal to 0.01 bar absolute and lower than or equal to 5 bar absolute. 
     
     
         3 . The process according to  claim 1 , wherein the electrolysis process is carried out in a diaphragm electrolysis cell or in a membrane electrolysis cell. 
     
     
         4 . The process according to  claim 1 , wherein the electrolysis process produces hydrogen, chlorine, and sodium hydroxide. 
     
     
         5 . The process according to  claim 4 , further comprising reacting at least a fraction of the sodium hydroxide with dichloropropanol in order to obtain epichlorohydrin and an aqueous composition containing sodium chloride. 
     
     
         6 . The process according to  claim 4 , further comprising reacting at least a fraction of the chlorine with hydrogen and/or a compound selected from the group consisting of propylene, methane, a chlorinated hydrocarbon, a chlorohydrofluorocarbon, and mixtures thereof, in order to obtain hydrogen chloride. 
     
     
         7 . The process according to  claim 4 , further comprising reacting at least a fraction of the chlorine with silicon and/or high silicon ferrosilicon and/or silicon carbide and/or silica and carbon in order to obtain silicon tetrachloride, and/or with ethylene in order to obtain 1,2-dichloroethane and/or carbon monoxide in order to obtain phosgene. 
     
     
         8 . The process according to  claim 7 , further comprising submitting silicon tetrachloride to flame hydrolysis and/or further comprising submitting 1,2-dichloroethane to pyrolysis and/or further comprising reacting phosgene with anamine, in order to obtain hydrogen chloride. 
     
     
         9 . The process according to  claim 6 , further comprising reacting at least a fraction of the hydrogen chloride with glycerol in order to obtain dichloropropanol. 
     
     
         10 . The process according to  claim 8 , further comprising reacting at least a fraction of the hydrogen chloride with glycerol in order to obtain dichloropropanol. 
     
     
         11 . The process according to  claim 9 , further comprising reacting at least a fraction of the dichloropropanol with sodium hydroxide in order to obtain epichlorohydrin and an aqueous composition comprising sodium chloride. 
     
     
         12 . The process according to  claim 10 , further comprising reacting at least a fraction of the dichloropropanol with sodium hydroxide in order to obtain epichlorohydrin and an aqueous composition comprising sodium chloride. 
     
     
         13 . The process according to  claim 11 , wherein the aqueous composition comprising sodium chloride is reacted with active chlorine in order to obtain an aqueous composition having a total organic carbon content of at least 1 μg of C/l and at most 5 g of C/l of composition and comprising at least one salt in an amount of at least 30 g/kg of composition and at least one carboxylic acid. 
     
     
         14 . The process according to  claim 12 , wherein the aqueous composition comprising sodium chloride is reacted with active chlorine in order to obtain an aqueous composition having a total organic carbon content of at least 1 μg of C/l and at most 5 g of C/l of composition and comprising at least one salt in an amount of at least 30 g/kg of composition and at least one carboxylic acid. 
     
     
         15 . The method according to  claim 13 , wherein the active chlorine comprises chlorine. 
     
     
         16 . The method according to  claim 14 , wherein the active chlorine comprises chlorine. 
     
     
         17 . A process for the production of epichlorohydrin comprising:
 I. manufacturing dichloropropanol by chlorination of glycerol with hydrogen chloride   II. dehydrochlorination of the dichloropropanol obtained in (I) with sodium hydroxide in order to obtain epichlorohydrin and an aqueous composition containing sodium chloride   III. treating the aqueous composition of (II) comprising a reaction with active chlorine in order to obtain an aqueous composition having a total organic carbon content of at least 1 μg of C/l and at most 5 g of C/l of composition and comprising at least one salt in an amount of at least 30 g/kg of composition and at least one carboxylic acid   IV. electrolysing the aqueous composition of (III) in order to obtain hydrogen, chlorine and sodium hydroxide,   
       and optionally at least one the following steps
 V. recycling in (II) a fraction of the sodium hydroxide obtained in (IV) 
 VI. reacting a fraction of chlorine obtained in (IV) with 
 a. hydrogen obtained in (IV) and/or 
 b. a compound selected from propylene, methane, a chlorinated hydrocarbon, a chlorohydrofluorocarbon, or a mixture thereof 
 in order to produce hydrogen chloride and recycling a fraction of hydrogen chloride produced in (VI) in (I) 
 VII. reacting a fraction of chlorine obtained in (IV) with 
 a. silicon to generate silicon tetrachloride and/or ethylene to generate 1,2-dichloroethane and/or carbon monoxide to generate phosgene, and/or 
 b. submitting silicon tetrachloride and/or 1,2-dichloroethane and/or phosgene to respectively flame hydrolysis, pyrolysis and reaction with amines 
 to produce hydrogen chloride and recycling a fraction of hydrogen produced in (VII) in (I), 
 VIII. recycling a fraction of chlorine obtained in (IV) in (III).