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Method for preparing pentaerythritol as well as formic acid and sodium nitrate

A technology of pentaerythritol and sodium nitrate, which is applied in the preparation of carboxylate, the preparation of alkali metal nitrate, the separation/purification of hydroxyl compounds, etc., can solve problems such as waste of raw materials, and achieve the effects of less investment in equipment and simple operation.

Inactive Publication Date: 2011-07-06
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 formic acid and sodium nitrate, 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 penta...

Embodiment 2

[0021] A method for preparing pentaerythritol co-production of formic acid and sodium nitrate, 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 pentaer...

Embodiment 3

[0026] Embodiment 3: a kind of method for preparing pentaerythritol co-production formic acid and sodium nitrate, wherein, sodium formate 25wt.%, pentaerythritol 7wt.%, its raw material is formaldehyde and acetaldehyde condensation production pentaerythritol gained waste liquid, comprises the steps:

[0027] 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;

[0028] Step B: washing, drying and pulverizing the pentaerythritol crystals obtained above to obtain a pentaeryth...

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PUM

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Abstract

The invention provides a method for preparing pentaerythritol as well as formic acid and sodium nitrate. The method comprises the following steps: waste liquor generated during the production of pentaerythritol through condensation of formaldehyde and acetaldehyde is distilled under reduced pressure to obtain a saturated pentaerythritol solution, the saturated pentaerythritol solution is then cooled, and pentaerythritol crystals and a filtrate I are obtained through filtering separation; the pentaerythritol crystals are washed, dried and crushed into pentaerythritol products; the filtrate I is distilled under reduced pressure into a saturated sodium formate solution, the saturated sodium formate solution is cooled, and sodium formate crystals are obtained through filtering separation; the sodium formate crystals are dissolved in water and then react with a nitric acid solution to obtain a solution, and then the solution is filtered to obtain a clear filtrate III; the filtrate III is distilled under reduced pressure to obtain a saturated sodium nitrate solution, and the saturated sodium nitrate solution is cooled, crystallized and filtered to obtain sodium nitrate crystals and a formic acid solution; the sodium nitrate crystals are washed, dried and crushed to obtain sodium nitrate products; and the formic acid solution is concentrated to obtain formic acid products.

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 formic acid and sodium nitrate, the raw material of which 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 stabiliz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/24C07C29/76C07C53/02C07C51/02C01D9/04
Inventor 王嘉兴
Owner 汪晋强