Patent application EP19173248A (EP), filed 2019-05-08
Publication number: EP3736262A1
Title: PROCESS FOR THE PURIFICATION OF A SOLUTION COMPRISING ACRYLAMIDE MONOMER
Abstract: The presently claimed invention is directed to a method for the purification of a solution comprising acrylamide.
IPC codes: C07C 231/    24            A I
C07C 233/    09            A I
Claims: number: 1
text: A process for the purification of a solution comprising acrylamide comprising at least the steps of:
number: 2
text: The process according to embodiment 1, wherein the solution comprising acrylamide has a pH in the range of ≥ 7 to ≤ 8.
number: 3
text: The process according to any of claims 1 to 2, wherein the acrylamide is present in the solution in a concentration in the range of ≥ 30.0 wt.-% to ≤ 60.0 wt.-%, based on the total weight of the solution.
number: 4
text: The process according to any of claims 1 to 3, wherein the solution comprising acrylamide comprises at least one surface active agent.
number: 5
text: The process according to claim 4, wherein the at least one surface active agent is present in an amount in the range of ≥ 1 ppm to ≤ 1000 ppm, based on the total weight of the solution.
number: 6
text: The process according to any of claims 1 to 5, wherein in step d) the activated carbon is treated by using a water solution that is saturated with air and contains the at least one stabilizer
or
the activated carbon is treated with humid air and a water solution that contains the at least stabilizer.
number: 7
text: The process according to claim 6, wherein in step d) the water solution is passed through the fixed-bed reactor at a flow rate in the range of ≥ 0.5 to ≤ 10 bed volume per hour.
number: 8
text: The process according to claim 6 or 7, wherein in step d) the water solution that is saturated with air and contains the at least one stabilizer is passed through the fixed-bed reactor in the direction of top to bottom.
number: 9
text: The process according to any of claims 1 to 8, wherein the at least one stabilizer is selected from the group consisting of p-methoxyphenol, 4-tert-butylcatechol, tert-butylhydroquinone, 1,4-benzoquinone, 6-tert-butyl-2,4-xylenol, 2,6-di-tert-butyl-p-cresol, 2,6-di-tert-butylphenol, 1,1-diphenyl-2-picrylhydrazyl free radical, hydroquinone, nitroso benzene, 4-nitroso-3-methylphenol, sodium-1-naphthylamine-4-sulfonate and phenothiazine.
number: 10
text: The process according to any of claims 1 to 9 further comprising the step of b) washing the fixed-bed reactor comprising activated carbon with water before step d).
number: 11
text: The process according to any of claims 1 to 10 further comprising the step of e) loading of the acrylamide solution to the activated fixed-bed reactor before step f).
number: 12
text: The process according to claim 1, wherein in step f) the solution comprising acrylamide is passed through the fixed-bed reactor at a flow rate in the range of ≥ 0.5 to ≤ 10 bed volume per hour.
number: 13
text: The process according any of claims 1 to 12, wherein the fixed-bed reactor is maintained at a temperature in the range of ≥ 10 to ≤ 50 °C.
number: 14
text: A process for purification of a solution comprising acrylamide comprising at least the steps of:
number: 15
text: The process according to claim 14, wherein the fixed-bed reactor is maintained at a temperature in the range of ≥ 10 to ≤ 50 °C.
Office action: search_report, dated 2020-11-11
Prior art cited: ref_id: US3923741A
ref_type: patent
severity: background
ref_id: EP0182578A1
ref_type: patent
severity: background
ref_id: EP1167345A1
ref_type: patent
severity: background
ref_id: - SAMBROOK; RUSSELL: "Molecular Cloning: A Laboratory Manual", 2001, CSH PRESS
ref_type: npl
severity: background
ref_id: - CHEMICAL ABSTRACTS, Columbus, Ohio, US; abstract no. 2391-37-5
ref_type: npl
severity: background
ref_id: EP0182578A1
ref_type: patent
severity: background
ref_id: US3947518A
ref_type: patent
severity: background
ref_id: US3947518
ref_type: patent
severity: background
ref_id: EP0182578
ref_type: patent
severity: background
Final disposition: pending (2020-11-11)