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Method for preparing formic acid coproduced with calcium nitrate and hydrochloric acid from chloroform leftovers

A technology of leftovers and calcium nitrate, which is applied to the preparation of chloride, calcium/strontium/barium nitrate, chlorine/hydrogen chloride, etc., which can solve the problems of wasting resources and polluting the environment

Inactive Publication Date: 2012-01-25
王嘉兴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Calcium formate is a valuable chemical raw material, while lime paste is often treated as waste, which not only wastes resources, but also pollutes the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A method for producing formic acid with chloroform leftovers to co-produce calcium nitrate and hydrochloric acid, comprising the steps:

[0016] Step A: Dilute and dissolve 500kg of chloroform leftovers with water. The amount of water added is controlled so that the concentration of calcium formate in the feed liquid is not higher than 160g / L. Liquid and lower sediment, obtain 2220L supernatant liquid and be chloroform leftovers leaching liquid, wherein the content of calcium formate is 160 grams / L, and calcium chloride content is 50 grams / L, and calcium hydroxide content is 2 grams / L, also Contains a very small amount of sodium chloride; the leaching solution of chloroform leftovers and nitric acid, the molar ratio of the sum of the molar amounts of calcium formate, calcium chloride and calcium hydroxide to the molar amount of nitric acid is 1:2 and put into a corrosion-resistant reactor , react under stirring to generate a mixed liquid containing formic acid, calcium ...

Embodiment 2

[0020] A method for producing formic acid with chloroform leftovers to co-produce calcium nitrate and hydrochloric acid, comprising the steps:

[0021] Step A: Dilute and dissolve 500kg of chloroform leftovers with water. The amount of water added is controlled so that the concentration of calcium formate in the feed liquid is not higher than 160g / L. liquid and lower sediment, the supernatant is chloroform leftovers leaching liquid, wherein the content of calcium formate is 130 g / L, the content of calcium chloride is 60 g / L, the content of calcium hydroxide is 2 g / L, and it also contains extremely A small amount of sodium chloride; chloroform leftovers leaching solution and nitric acid, the molar ratio of calcium formate, calcium chloride and calcium hydroxide and the molar weight of nitric acid are 1: 2.4 drop in the corrosion-resistant reactor, in Under stirring, the reaction generates a mixed liquid containing formic acid, calcium nitrate and hydrochloric acid;

[0022] St...

Embodiment 3

[0025] A method for producing formic acid with chloroform leftovers to co-produce calcium nitrate and hydrochloric acid, comprising the steps:

[0026] Step A: Dilute and dissolve 500kg of chloroform leftovers with water. The amount of water added is controlled so that the concentration of calcium formate in the feed liquid is not higher than 160g / L. liquid and lower sediment, the supernatant is chloroform leftovers leaching liquid, wherein the content of calcium formate is 150 g / L, the content of calcium chloride is 40 g / L, the content of calcium hydroxide is 2 g / L, and it also contains extremely A small amount of sodium chloride; chloroform leftovers leaching solution and nitric acid, with the ratio of the molar weight sum of calcium formate, calcium chloride and calcium hydroxide and the molar weight of nitric acid is 1: 1.6 drops in the corrosion-resistant reactor, in Under stirring, the reaction generates a mixed liquid containing formic acid, calcium nitrate and hydrochl...

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PUM

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Abstract

The invention provides a method for preparing formic acid coproduced with calcium nitrate and hydrochloric acid from chloroform leftovers. The method is characterized by comprising the following steps of: diluting and dissolving chloroform leftovers with water to obtain a chloroform leftover leach liquor, and mixing and reacting with nitric acid to generate a mixed liquid which contains formic acid, calcium nitrate and hydrochloric acid; filtering a small quantity of filter cake impurities out to obtain a first filtrate; condensing the first filtrate to 6-8.3 DEG C by using a condenser, solidifying formic acid and filtering at low temperature to separating formic acid and a second filtrate, feeding the second filtrate into a distiller for distilling under reduced pressure to obtain a calcium nitrate supersaturated solution, cooling, crystallizing, separating calcium nitrate crystals out, and filtering and separating calcium nitrate and hydrochloric acid solutions. According to the method, pollution caused by chloroform leftovers is reduced effectively, products such as formic acid, calcium nitrate, hydrochloric acid and the like are developed, and a remarkable economic benefit is created.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of three wastes in the organic chemical industry, and in particular relates to the comprehensive utilization of chloroform leftovers, in particular to a method for producing formic acid and co-producing calcium nitrate and hydrochloric acid with chloroform leftovers. Background technique [0002] Chloroform and lime are used in industry to carry out alkaline hydrolysis to produce chloroform (chloroform), and the chloroform produced is steamed out to make products, and the rest is chloroform leftovers, commonly known as lime paste. The main components of lime paste are calcium formate (by-product), lime (excess raw material) and calcium chloride. According to calculations, 0.5 tons of calcium formate can be produced for every ton of chloroform produced. Calcium formate is a valuable chemical raw material, while lime paste is often treated as waste, which not only wastes resources...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C53/02C07C51/02C01B7/03C01F11/38
Inventor 王嘉兴
Owner 王嘉兴