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Method for preparing pentaerythritol along with zinc formate and sodium sulfide

A technology of pentaerythritol and sodium sulfide, applied in the preparation of carboxylates, separation/purification of hydroxyl compounds, alkali metal sulfides/polysulfides, etc., can solve problems such as waste of raw materials, and achieve the effect of less equipment investment and simple operation

Inactive Publication Date: 2011-07-13
汪晋强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] If the waste liquid obtained from the production of pentaerythritol is discharged or discarded arbitrarily, without affecting the environment, raw materials are also wasted. For this reason, it is necessary to explore comprehensive treatment and application methods for the waste liquid obtained from the production of pentaerythritol

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: a kind of method for preparing pentaerythritol co-production zinc formate and sodium sulfide, its raw material is the waste liquid that formaldehyde and acetaldehyde condensation produce pentaerythritol gained, wherein, sodium formate 25wt.%, pentaerythritol 7wt.%, comprise the steps:

[0016] Step A: Formaldehyde and acetaldehyde are condensed to produce 544kg of waste liquid gained from pentaerythritol, which is distilled under reduced pressure to be a pentaerythritol saturated solution, then cooled, and pentaerythritol crystals are separated out, and separated by filtration to obtain pentaerythritol crystals and filtrate one; filtrate one is further distilled under reduced pressure to obtain Saturated solution of sodium formate, then cooling, sodium formate crystallization, separated by filtration to obtain sodium formate crystals and filtrate 2;

[0017] Step B: washing, drying and pulverizing the pentaerythritol crystals obtained above to obtain a pent...

Embodiment 2

[0021] A method for preparing pentaerythritol to co-produce zinc formate and sodium sulfide, its raw material is the waste liquid obtained by condensation of formaldehyde and acetaldehyde to produce pentaerythritol, wherein, sodium formate 25wt.%, pentaerythritol 7wt.%, comprises the following steps:

[0022] Step A: Formaldehyde and acetaldehyde are condensed to produce 544kg of waste liquid gained from pentaerythritol, which is distilled under reduced pressure to be a pentaerythritol saturated solution, then cooled, and pentaerythritol crystals are separated out, and separated by filtration to obtain pentaerythritol crystals and filtrate one; filtrate one is further distilled under reduced pressure to obtain Saturated solution of sodium formate, then cooling, sodium formate crystallization, separated by filtration to obtain sodium formate crystals and filtrate 2;

[0023] Step B: washing, drying and pulverizing the pentaerythritol crystals obtained above to obtain a pentaeryt...

Embodiment 3

[0027] A method for preparing pentaerythritol co-production zinc formate and sodium sulfide, wherein, sodium formate 25wt.%, pentaerythritol 7wt.%, its raw material is formaldehyde and acetaldehyde condensation production pentaerythritol gained waste liquid, comprising the steps:

[0028] Step A: Formaldehyde and acetaldehyde are condensed to produce 544kg of waste liquid gained from pentaerythritol, which is distilled under reduced pressure to be a pentaerythritol saturated solution, then cooled, and pentaerythritol crystals are separated out, and separated by filtration to obtain pentaerythritol crystals and filtrate one; filtrate one is further distilled under reduced pressure to obtain Saturated solution of sodium formate, then cooling, sodium formate crystallization, separated by filtration to obtain sodium formate crystals and filtrate 2;

[0029] Step B: washing, drying and pulverizing the pentaerythritol crystals obtained above to obtain a pentaerythritol product; the q...

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PUM

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Abstract

The invention provides a method for preparing pentaerythritol along with zinc formate and sodium sulfide. The method comprises the following steps: using the production waste liquid of pentaerythritol prepared from formaldehyde and acetaldehyde to perform reduced pressure distillation and obtain pentaerythritol saturated solution, cooling, performing filtering separation to obtain pentaerythritol crystals and filtrate 1; washing, drying and grinding pentaerythritol crystals to obtain a pentaerythritol product; perform reduced pressure distillation to the filtrate 1 to obtain sodium formate saturated solution, cooling, performing filtering separation to obtain sodium formate crystals, dissolving sodium formate crystals in water, reacting with zinc sulfide solution, filtering to obtain clear filtrate 3; and distilling and cooling the filtrate 3 to crystallize and obtain the mixed product of zinc formate and sodium sulfide.

Description

technical field [0001] The invention relates to the technical field of treatment and utilization of waste liquid obtained from producing pentaerythritol in organic chemical industry, in particular to a method for preparing pentaerythritol and co-producing zinc formate and sodium sulfide. The raw material is the waste liquid obtained from producing pentaerythritol. Background technique [0002] Pentaerythritol is an organic intermediate with a wide range of uses. It is often used in the coating industry and is a raw material for alkyd coatings. It can improve the hardness, gloss and durability of coating films; it is also used as printing inks for varnishes and colored paints, etc. The raw material of rosin resin, and can be used to manufacture flame-retardant coatings, drying oils and aviation oil lubricants, etc. Pentaerythritol tetranitrate made from pentaerythritol is an explosive explosive. Pentaerythritol fatty acid ester can be used as plasticizer and stabilizer of po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/24C07C29/76C07C53/06C07C51/41C01B17/22
Inventor 王嘉兴
Owner 汪晋强