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Novel process for separating pentaerythritol and byproduct sodium formate by membrane method

A technology for by-products of sodium formate and pentaerythritol, applied in separation methods, separation of dispersed particles, separation/purification of carboxylic acid compounds, etc., to achieve the effects of shortening the process flow, easy control of equipment, and reducing water consumption

Pending Publication Date: 2021-11-05
浙江蓝波新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Comprehensive prior art comparison, the method for directly separating pentaerythritol and sodium formate by ion-exchange membrane method has not been reported

Method used

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  • Novel process for separating pentaerythritol and byproduct sodium formate by membrane method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Pour 500 mL of pentaerythritol condensation solution into the electrodialysis fresh water tank, the conductivity of the material is 45 ms / cm, add 300 mL of pure water to the electrodialysis concentrated water tank as the receiving liquid, and add 500 mL of 4% sodium sulfate to the polar water tank as the polar water , select the alloy membrane electrodialysis device, set the voltage to 15 V, the current to 1.3 A, start the electrodialysis desalination system, stop the operation when the conductivity of the electrodialysis fresh water tank material drops below 0.01 ms / cm, and obtain 400 mL of pentaerythritol desalination in the electrodialysis fresh water tank solution, electrodialysis concentrated water tank to obtain 400 mL sodium formate solution.

Embodiment 2

[0020] Pour 50 L of pentaerythritol condensation solution into the electrodialysis fresh water tank, the conductivity of the material is 50 ms / cm, add 15 L of pure water to the electrodialysis concentrated water tank as the receiving solution, and add 20 L of sodium sulfate with a concentration of 4% to the polar water tank as the polar water , select the homogeneous membrane electrodialysis device, set the voltage to 15 V and the current to 20 A, start the electrodialysis desalination system, stop the operation when the conductivity of the electrodialysis fresh water tank material drops below 0.01 ms / cm, and obtain 38 L of pentaerythritol in the electrodialysis fresh water tank Desalted solution, electrodialysis concentrated water tank to obtain 26.8 L sodium formate solution. The pentaerythritol desalted solution was evaporated to dryness and crystallized to obtain 4.1 kg of solid pentaerythritol product; the sodium formate solution was evaporated to dryness to obtain 2.5 kg ...

Embodiment 3

[0022] will be 2 m 3 The pentaerythritol condensation liquid is poured into the electrodialysis fresh water tank, the conductivity of the material is 48.5 ms / cm, and the electrodialysis concentrated water tank is added with 0.5 m 3 Pure water was used as the receiving liquid, and 0.5 m 3 Sodium sulfate with a concentration of 4% is used as the polar water, and the alloy membrane electrodialysis device is selected, the voltage is set to 250 V, the current is 120 A, the electrodialysis desalination system is started, and the operation is stopped when the conductivity of the electrodialysis fresh water tank material drops below 0.01 ms / cm , the electrodialysis fresh water tank obtains 1.6 m 3 Pentaerythritol desalination solution, electrodialysis concentrated water tank to obtain 0.9 m 3 Sodium formate solution. The pentaerythritol desalted solution was evaporated to dryness and crystallized to obtain 168 kg of solid pentaerythritol product; the sodium formate solution was eva...

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Abstract

The invention discloses a process for removing a byproduct sodium formate from a pentaerythritol condensation liquid. The process comprises the following steps of: directly separating pentaerythritol and sodium formate in a condensation liquid by adopting an ion exchange membrane; respectively evaporating and drying the separated pentaerythritol solution and sodium formate solution to obtain a pentaerythritol product and a sodium formate byproduct. The removal rate of sodium formate in the condensation liquid can reach 99.5% or above. The method has the following advantages that: (1) the membrane process is short in process flow, and the complicated steps of rectification, evaporation, crystallization and desalination in the traditional process are avoided; (2) the removal rate of the sodium formate byproduct is high, the sodium formate byproduct separated by the electrodialysis process does not contain pentaerythritol, and the loss rate of the pentaerythritol product in the traditional process is reduced; (3) the evaporation energy consumption is saved, the washing step is avoided, the process water is reduced, and the contents of the sodium formate byproduct and pentaerythritol separated by electrodialysis are both greater than 15%; and (4) process operation is convenient, the technology is mature and stable, operation cost and investment are low, and automatic clean production can be realized.

Description

technical field [0001] The invention belongs to the technical field of purification and processing of by-products of polyols, and in particular relates to a method for separating and purifying sodium formate, a by-product of pentaerythritol production. Background technique [0002] Pentaerythritol, the simplified structure is C 5 h 12 o 4 , is white crystal or powder, easy to be esterified by general organics, widely used in the coating industry to produce alkyd resin, synthesize advanced lubricants, plasticizers, surfactants, medicines, explosives, etc. The traditional pentaerythritol production process includes six steps: addition reaction, excess formaldehyde distillation, formic acid neutralization of residual alkali, concentration to obtain crude pentaerythritol crystals, vacuum concentration to obtain sodium formate, and crude pentaerythritol crystals to dissolve and refine. Most of the production methods of pentaerythritol in the prior art are based on sodium hydro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/24C07C29/74C07C51/44C07C53/06C02F1/469
CPCC07C29/74C07C51/44C02F1/4693C07C31/24C07C53/06Y02A20/124
Inventor 高道林张楠舒自学
Owner 浙江蓝波新材料科技有限公司