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Method utilizing acetic acid in PTA oxidation residues to prepare sodium acetate trihydrate

A technology of sodium acetate trihydrate and residue, applied in the preparation of carboxylate, organic chemistry, etc., can solve the problems of difficult removal, low content of dilute acetic acid, and high content of impurities, and achieves reduction of sewage discharge, reasonable process route, and technical stability. Good results

Inactive Publication Date: 2010-06-23
辽阳合成催化剂有限公司
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Problems solved by technology

This technology has the problem of difficult separation, and the isolated sodium acetate trihydrate has low purity and low yield
And in other various documents, do not see the report that reclaims high-purity dilute acetic acid to prepare sodium acetate again in the PTA oxidation residue, its main reason is exactly that the dilute acetic acid that reclaims has content low, and many difficulties such as high impurity content and difficult removal, therefore At present, many companies that produce PTA directly discharge the dilute acetic acid to the comprehensive wastewater treatment plant for treatment, which not only loses effective resource reuse, but also increases huge costs for sewage treatment

Method used

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Examples

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Embodiment

[0019] Put 1000L of the cobalt and manganese removal mother liquor retrieved from the PTA oxidation residue recovery workshop into the distillation still, distill under the conditions of stirring and decompression to distill benzoic acid, the stirring speed is 70 rpm, and the vacuum degree is -0.085, The temperature in the kettle is 65°C; put the purified dilute acetic acid into the reaction kettle, slowly add flake sodium hydroxide for neutralization under the conditions of stirring and water cooling, the stirring speed is 70 rpm, and the reaction temperature is 65°C, the end point pH is controlled at 11, after adding sodium hydroxide, keep it warm for 1 hour; put the neutralized sodium acetate reaction solution into the distillation kettle, heat and evaporate under the condition of stirring and reducing pressure, the stirring speed is 70 rpm / min, the vacuum degree is -0.075Mpa, and the temperature in the kettle is 75°C. When the concentration of sodium acetate reaches 80%, m...

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Abstract

The invention relates to a method utilizing acetic acid in purified terephthalic acid oxidation residues to prepare sodium acetate trihydrate. The method includes the following steps of: 1. purification of dilute acetic acid; 2. neutralization; 3. evaporation; 4. impurities removing; 5. crystallization; 6. drying.

Description

Technical field [0001] The invention relates to a method for preparing sodium acetate trihydrate from acetic acid in PTA oxidation residue. Background technique [0002] It is understood that at present, the technical process routes of sodium acetate trihydrate used at home and abroad are divided into two categories according to the different alkali raw materials used: one is based on sodium hydroxide, and the other is based on sodium carbonate. According to the acetic acid used, it can be divided into pure acetic acid and recovered dilute acetic acid. According to literature search, Nanjing Yangzi Petrochemical Industry Corporation published the technology of "Recycling of Cobalt-Manganese Separation Liquid" in Synthesis Technology and Application-2000.15(3).-39-41, which described the use of PTA oxidation residue as raw material, The noble metal cobalt-manganese catalyst is firstly recovered, and then directly neutralized by adding alkali to form a mixture of all residual...

Claims

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Application Information

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IPC IPC(8): C07C53/10C07C51/41
Inventor 朱素凡李宝锁刘钦诗
Owner 辽阳合成催化剂有限公司
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