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Method for preparing calcium formate coproduced with calcium chloride and calcium hydroxide from chloroform leftovers

A technology of calcium hydroxide and leftovers, applied in the direction of calcium/strontium/barium oxide/hydroxide, calcium/strontium/barium chloride, alkali metal chloride, etc., can solve the problems of wasting resources, polluting the environment, etc. Achieve the effect of pollution control and obvious economic benefits

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

[0009] A method for producing calcium formate co-producing calcium chloride and calcium hydroxide with chloroform leftovers, comprising the steps of diluting and dissolving 500kg of chloroform leftovers with water, and controlling the amount of water added so that the concentration of calcium formate in the feed liquid is not higher than 160g / L, after stirring evenly, precipitate until the solution is divided into supernatant and lower sediment; separate the supernatant and lower sediment, the supernatant is the chloroform waste leaching solution, wherein the content of calcium formate is 150 g / L, chlorine The calcium chloride content is 50 g / L, the calcium hydroxide content is 2 g / L, and also contains a very small amount of sodium chloride; the chloroform leftover leaching solution is sent to a vacuum distiller, stirred, heated to 60 ° C, and mixed with Distillation under reduced pressure under the negative pressure of 410 millimeters of mercury, when calcium formate reaches ...

Embodiment 2

[0011] A method for producing calcium formate co-producing calcium chloride and calcium hydroxide with chloroform leftovers, comprising the steps of diluting and dissolving 500kg of chloroform leftovers with water, and controlling the amount of water added so that the concentration of calcium formate in the feed liquid is not higher than 160g / L, after stirring evenly, precipitate until the solution is divided into a supernatant and a lower sediment; separate the supernatant and the lower sediment, the supernatant is the chloroform leftover leaching solution, wherein the content of calcium formate is 130 g / L, chlorine The calcium chloride content is 40 g / L, the calcium hydroxide content is 2 g / L, and also contains a very small amount of sodium chloride; the chloroform leftover leaching solution is sent to a vacuum distiller, stirred, heated to 20 ° C, and mixed with Distillation under reduced pressure under the negative pressure of 400 millimeters of mercury, when calcium forma...

Embodiment 3

[0013] A method for producing calcium formate co-producing calcium chloride and calcium hydroxide with chloroform leftovers, comprising the steps of diluting and dissolving 500kg of chloroform leftovers with water, and controlling the amount of water added so that the concentration of calcium formate in the feed liquid is not higher than 160g / L, after stirring evenly, precipitate until the solution is divided into supernatant and lower sediment; separate the supernatant and lower sediment, the supernatant is the chloroform waste leaching solution, wherein the content of calcium formate is 170 g / L, chlorine The calcium chloride content is 60 g / L, the calcium hydroxide content is 2 g / L, and also contains a very small amount of sodium chloride; the chloroform waste leaching solution is sent to a vacuum distiller, stirred, heated to 100 ° C, and mixed with Distillation under reduced pressure under the negative pressure of 420 millimeters of mercury, when calcium formate reaches su...

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PUM

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Abstract

The invention provides a method for preparing calcium formate coproduced with calcium chloride and calcium hydroxide from chloroform leftovers. The method comprises the following steps of: diluting and dissolving chloroform leftovers with water, and leaching soluble substances out to obtain a chloroform leftover leach liquor; feeding the a chloroform leftover leach liquor into a reduced pressure distiller for distilling under reduced pressure, and separating calcium formate crystals out and filtering the chloroform leftovers in hot state when calcium formate reaches a supersaturating concentration while the concentration of calcium chloride is lower than a supersaturating concentration at the same temperature to obtain calcium formate crystals and a first filtrate; drying the formate crystals and smashing to obtain a calcium formate product; and feeding the first filtrate, distilling under reduced pressure, and separating calcium chloride and sodium chloride products. According to the method, pollution caused by chloroform leftovers is reduced effectively, products such as calcium formate, sodium hydroxide, calcium chloride 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 calcium formate and co-producing calcium chloride and calcium hydroxide 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 reso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C53/06C07C51/41C01F11/24C01F11/32C01F11/02C01F11/16C01D3/04C01D3/14
Inventor 王嘉兴
Owner 王嘉兴