C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
C01B 17/90 (2006.01) C01B 17/92 (2006.01) C07C 29/74 (2006.01) C07C 29/88 (2006.01) C07C 31/04 (2006.01)
Patent
CA 2260310
An improved method of recovering sulfuric acid and methanol from contaminated spent, aqueous sulfuric acid solution comprising sulfuric acid, ammonium salts, methanol, organic compounds and water, obtained from a process for the manufacture of methyl methacrylate, said process comprising heating said spent solution to produce a second sulfuric acid solution having enhanced sulfuric acid concentration and an overheads mixture comprising methanol, formic acid and other light organic compounds and water; and recycling said mixture back to said methyl methacrylate manufacturing process, the improvement comprising (i) treating said aqueous mixture with a base to a pH of at least 7 to produce a non-acidic solution; and (ii) heating said non- acidic solution to provide a second mixture of reduced formic acid concentration and a residual liquor containing a formate salt. The invention provides reduced capital and operating costs in recycling sulfuric acid, methanol and water back to the methyl methacrylate manufacturing process.
Dijkstra Rene
Evans Colin M.
Harper Stuart R.
Lawler Daniel W.
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