System and method for recovering CTA residues and purifying/regenerating catalyst
First Claim
1. A method for recovering CTA (crude terephthalic acid) residues and purifying and regenerating catalyst, being used for recovering CTA (crude terephthalic acid) residues generated in a reaction process of oxidation in manufacturing PTA (purified terephthalic acid), said system comprises following steps:
- water washing CTA (crude terephthalic acid) residues;
CTA residues are added with water for stirring in order to resolve catalyst discharged from said process of oxidation of said PAT (purified terephthalic acid) into said water;
first time filtering and separating;
said catalyst resolved in water is separated from solid organic material;
sedimentation;
said catalyst resolved in said water is added with inorganic alkali being used as an agent for sedimentation to collect metallic ions in said water, and concentration of said metallic ions in said water is lowered to a level to be adapted for discharging, and metallic salt is generated;
second time filtering and separating;
said metallic salt is filtered and collected, said catalyst then is purified and regenerated to produce oxidized catalyst from said metallic salt; and
said purifying and regenerating catalyst includes steps of cobalt purifying/regenerating and oxidized catalyst producing wherein said cobalt purifying/regenerating step includes;
a) an acid solution step;
to resolve solid metal by adding inorganic acid solution;
b) a neutralization and sedimentation step;
to adjust pH value of said liquid to 4 to eliminate iron ions to form solution before extradition;
c) a resin treatment step;
to remove copper, nickel and chromium ions from said solution before extraction;
d) a metal extraction step;
to remove zinc and iron ions from said solution before extraction by extraction using organic extractant; and
e) an electrolyzing step;
to obtain metal cobalt by electrolyzing from liquid after extraction.
1 Assignment
0 Petitions
Accused Products
Abstract
A system/method for recovering CTA (crude terephthalic acid) residues and purifying and regenerating catalyst, being used for recovering residues generated in the reaction processes of oxidation in manufacturing PTA (purified terephthalic acid) as well as purifying and regenerating the residues to form oxidized catalyst to be circulated for reusing; wherein there are mainly a CTA residue recovering system and a catalyst purifying/regenerating system. The CTA residue recovering system treats the CTA residues and collects metallic salt that is then sent to the catalyst purifying/regenerating system and is reduced by electrolyzing metal cobalt with a cobalt purifying/ regenerating system, then is passed to an oxidized catalyst producing system to produce oxidized catalyst to be circulated for use in the oxidation reaction process for manufacturing PTA.
-
Citations
28 Claims
-
1. A method for recovering CTA (crude terephthalic acid) residues and purifying and regenerating catalyst, being used for recovering CTA (crude terephthalic acid) residues generated in a reaction process of oxidation in manufacturing PTA (purified terephthalic acid), said system comprises following steps:
-
water washing CTA (crude terephthalic acid) residues;
CTA residues are added with water for stirring in order to resolve catalyst discharged from said process of oxidation of said PAT (purified terephthalic acid) into said water;first time filtering and separating;
said catalyst resolved in water is separated from solid organic material;sedimentation;
said catalyst resolved in said water is added with inorganic alkali being used as an agent for sedimentation to collect metallic ions in said water, and concentration of said metallic ions in said water is lowered to a level to be adapted for discharging, and metallic salt is generated;second time filtering and separating;
said metallic salt is filtered and collected, said catalyst then is purified and regenerated to produce oxidized catalyst from said metallic salt; and
said purifying and regenerating catalyst includes steps of cobalt purifying/regenerating and oxidized catalyst producing wherein said cobalt purifying/regenerating step includes;a) an acid solution step;
to resolve solid metal by adding inorganic acid solution;b) a neutralization and sedimentation step;
to adjust pH value of said liquid to 4 to eliminate iron ions to form solution before extradition;c) a resin treatment step;
to remove copper, nickel and chromium ions from said solution before extraction;d) a metal extraction step;
to remove zinc and iron ions from said solution before extraction by extraction using organic extractant; ande) an electrolyzing step;
to obtain metal cobalt by electrolyzing from liquid after extraction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
-
Specification