CN101982452A - Method for extracting terephthalic acid from alkali weight reduction waste liquor - Google Patents
Method for extracting terephthalic acid from alkali weight reduction waste liquor Download PDFInfo
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- CN101982452A CN101982452A CN2010105197681A CN201010519768A CN101982452A CN 101982452 A CN101982452 A CN 101982452A CN 2010105197681 A CN2010105197681 A CN 2010105197681A CN 201010519768 A CN201010519768 A CN 201010519768A CN 101982452 A CN101982452 A CN 101982452A
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- terephthalic acid
- weight reduction
- waste liquor
- alkali weight
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Abstract
A method for extracting terephthalic acid from alkali weight reduction waste liquor relates to the technical field of treatment of industrial waste liquor. The method is characterized by firstly filtering the alkali weight reduction waste liquor of the polyester fabrics by a nano ceramic filter or a laser drilling stainless steel filter to obtain filtrate, taking the disodium terephthalate mixed liquor intercepted in the filter, then adding sulfuric acid to the disodium terephthalate mixed liquor, ensuring the mixed liquor to react under the condition that the pH value is 3-7.0, extracting the solid generated after reaction, washing and dehydrating the solid and finally drying the solid, thus obtaining the terephthalic acid. The method can conveniently and quickly obtain the regenerated material with higher purity, terephthalic acid and can greatly improve the value in use of the alkali weight reduction waste liquor of the polyester fabrics and reduce the harmless treatment cost of the alkali weight reduction waste liquor of the polyester fabrics.
Description
Technical field
The present invention relates in the processing technology field of industrial production waste liquid, particularly textile industry the alkali decrement of polyester (polyester) fabric be added processing, the recovery and utilization technology field of the waste liquid that produces man-hour.
Background technology
Because polyester (polyester, abbreviation PET) fiber has characteristics such as outstanding Physical Mechanical, weather resistance, crease resistance and water-repellancy, and be widely used in the clothes fiber, but, its certain defective is arranged as the clothes fiber because PET fibre strength and hardness are big, feel is relatively poor.The method that occurs in order to improve this defective is exactly the processing of alkali decrement.
The alkali decrement working method of present dacron fabric can be divided into two kinds of liquid streaming and continous ways substantially:
In alkali decrement complete processing according to the weight ratio of dacron fabric, having the terephthalic acid double sodium salt that is equivalent to 15-25% and ethylene glycol to be separated coalescence is mixed in the alkali waste water, terephthalic acid double sodium salt and ethylene glycol are measured benchmark with the contaminated wastewater degree, and (BOD, COD) numerical value is increased to hundreds of times to thousands of times.So, just need a huge processing costs.Therefore the wastewater treatment expense is very big at relevant industries field proportion.To the research of method of wastewater treatment with make great efforts continuing always, but up to the present, still fail to find out a kind of effectively, the way of economy type.
Existing a kind of technology is: the Waste Water Centralized after the alkali decrement processing of dacron fabric behind the waste water processing station, is transferred to neutrality with its pH value earlier; Again the terephthalic acid double sodium salt is dropped into sulfuric acid (H
2SO
4) after the neutralization, again terephthalic acid (TA:Terephthalate Acid) is separated.So, because after terephthalic acid has infusible precipitate, be eliminated easily.After this, with the microbiological degradation method ethylene glycol is removed again.But method of wastewater treatment also needs the huge expense of huge input; About precipitated terephthalic acid, also effectively do not utilize method at present, can only burning disposal.Up to now, great majority research and the visual angle major part of relevant patented technology are carried out on the method for high purity process the terephthalic acid that produces after concentrating on the terephthalic acid double sodium salt being carried out neutralizing treatment.
Summary of the invention
The present invention's first purpose provide a kind of can be easily and fast, from the alkali decrement processing-waste of dacron fabric, extract method of terephthalic acid to high purity.
Technical scheme of the present invention is: the alkali decrement processing-waste with dacron fabric filters out filtered solution by nano ceramics strainer or laser boring formula Stainless Steel Filter earlier, get the terephthalic acid double sodium salt mixed solution that dams in described strainer, in described terephthalic acid double sodium salt mixed solution, add sulfuric acid again, making mixed solution is to react under 3～7.0 the condition in the PH value, the solid that abstraction reaction generates, again with solid through water washing, dehydration, at last the oven dry, promptly get terephthalic acid.
The higher terephthalic acid double sodium salt of purity under the present invention can be dammed by nano ceramics strainer or laser boring formula Stainless Steel Filter, after specific reaction conditions, become to give birth to crude product terephthalic acid solid and sodium sulfate respectively, with the crude product terephthalic acid solid again through water washing, dehydration, further remove the residual sodium sulfate on crude product surface, at last oven dry.The present invention can be easily and fast, high purity ground obtains the higher twice-laid stuff of purity---terephthalic acid, also can carry out qualitative processing again, and as powder, granulation etc. form industrial chemical.The sodium sulfate that the present invention produces also can form the higher sodium sulfate product of purity after purifying.The present invention can improve the utility value of the alkali decrement processing-waste of dacron fabric greatly, reduces the harmless treatment cost of the alkali decrement processing-waste of dacron fabric.
Embodiment
Get the alkali decrement processing-waste of dacron fabric, by nano ceramics strainer or laser boring formula Stainless Steel Filter, the filtered solution that strainer is leached carries out the processing of alkali decrement again after naoh concentration is adjusted with the certain flow rate full dose.
Get the terephthalic acid double sodium salt mixed solution that dams in described strainer, this mixed solution is pumped in the reactor, in described terephthalic acid double sodium salt mixed solution, add sulfuric acid again, making mixed solution is to react under 3～7.0 the condition in the PH value, after question response stops, filter the solid that abstraction reaction generates.
Again with solid through water washing, dehydration repeatable operation three to four times, get the solids oven dry at last, promptly get terephthalic acid.
Claims (1)
1. from alkali decrement processing-waste, extract method of terephthalic acid, it is characterized in that elder generation filters out filtered solution with the alkali decrement processing-waste of dacron fabric by nano ceramics strainer or laser boring formula Stainless Steel Filter, get the terephthalic acid double sodium salt mixed solution that dams in described strainer, in described terephthalic acid double sodium salt mixed solution, add sulfuric acid again, making mixed solution is to react under 3～7.0 the condition in the PH value, the solid that abstraction reaction generates, again with solid through water washing, dehydration, oven dry promptly gets terephthalic acid at last.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105197681A CN101982452A (en) | 2010-10-26 | 2010-10-26 | Method for extracting terephthalic acid from alkali weight reduction waste liquor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105197681A CN101982452A (en) | 2010-10-26 | 2010-10-26 | Method for extracting terephthalic acid from alkali weight reduction waste liquor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101982452A true CN101982452A (en) | 2011-03-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105197681A Pending CN101982452A (en) | 2010-10-26 | 2010-10-26 | Method for extracting terephthalic acid from alkali weight reduction waste liquor |
Country Status (1)
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| CN (1) | CN101982452A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103848521A (en) * | 2014-03-17 | 2014-06-11 | 佛山市金铭机械制造有限公司 | Alkali deweighting wastewater recycling device |
| CN104098460A (en) * | 2014-07-10 | 2014-10-15 | 陆君 | Method for preparing high-purity terephthalic acid from alkali-minimization wastewater residues |
| CN108946873A (en) * | 2018-06-19 | 2018-12-07 | 苏州新能环境技术股份有限公司 | A kind of technique that embrane method processing alkali decrement waste water realizes lye reuse and antimony removal |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1257064A (en) * | 1999-12-16 | 2000-06-21 | 陈定良 | Process for recovering terephthalic acid from alkali reduced sewage |
| JP2000178375A (en) * | 1998-12-15 | 2000-06-27 | Asahi Chem Ind Co Ltd | Apparatus and process for decomposing polycondensation polymer |
-
2010
- 2010-10-26 CN CN2010105197681A patent/CN101982452A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000178375A (en) * | 1998-12-15 | 2000-06-27 | Asahi Chem Ind Co Ltd | Apparatus and process for decomposing polycondensation polymer |
| CN1257064A (en) * | 1999-12-16 | 2000-06-21 | 陈定良 | Process for recovering terephthalic acid from alkali reduced sewage |
Non-Patent Citations (3)
| Title |
|---|
| 刘超男等: "碱减量废水的TA回收研究", 《印染》 * |
| 洪芳柏等: "碱减量废水中回收对苯二甲酸的过程分析", 《浙江化工》 * |
| 邱凤鸣等: "涤纶织物碱减量处理废液中对苯二甲酸的回收", 《技术进步》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103848521A (en) * | 2014-03-17 | 2014-06-11 | 佛山市金铭机械制造有限公司 | Alkali deweighting wastewater recycling device |
| CN104098460A (en) * | 2014-07-10 | 2014-10-15 | 陆君 | Method for preparing high-purity terephthalic acid from alkali-minimization wastewater residues |
| CN108946873A (en) * | 2018-06-19 | 2018-12-07 | 苏州新能环境技术股份有限公司 | A kind of technique that embrane method processing alkali decrement waste water realizes lye reuse and antimony removal |
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Application publication date: 20110302 |