Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for producing calcium chloride dihydrate

A technology of calcium chloride dihydrate and its production method, which is applied in the direction of calcium/strontium/barium chloride, calcium/strontium/barium halide, etc., can solve the problems of equipment corrosion, high cost, and low product purity, and achieve recovery rate High and reduce the effect of product cost

Inactive Publication Date: 2010-03-31
TIANJIN LIHONG CHEM TECHN
View PDF0 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Food-grade magnesium chloride is an important raw material for food additives, and its magnesium chloride content is required to reach more than 99%. At present, most manufacturers in my country have been using the traditional ammonia-alkali manufacturing process. The production of calcium chloride dihydrate by this process consumes a lot of heat energy and the product purity Not high, the equipment is severely corroded, so the cost of the product is high

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0006] Embodiment: a kind of production method of calcium chloride dihydrate, 100 milliliters of 31% hydrochloric acid and limestone powder are dropped in the reaction tank by the ratio of 2.2: 1, react under stirring, generate acidic calcium chloride solution. Move the obtained solution into the clarification tank, add milk of lime, adjust the pH value of the solution to 8.9-9, at this time, iron hydroxide and magnesium hydroxide precipitate out. After clarification and filtration, transfer the filtrate in an evaporating dish and heat to 172-174°C to evaporate, crystallize, separate, and then dry and dehydrate at 200-240°C to obtain calcium chloride dihydrate.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for producing calcium chloride dihydrate, which is characterized by comprising the following steps: putting hydrochloric acid (31%) and limestone powder into a reaction vat according to the mixture ratio of 2.2:1, and stirring for reaction to generate an acid calcium chloride solution; transferring the obtained solution into a clarification tank, adding lime emulsion, regulating the pH value of the solution to 8.9-9 to precipitate out iron hydroxide and magnesium hydroxide; and transferring filtrate into an evaporation dish after clarifying and filtering, heating to the temperature of 172-174 DEG C, evaporating, drying and dewatering at the temperature of 200-240 DEG C after crystallizing and separating, to obtain the calcium chloride dihydrate. The invention has the following advantages of no pollution, high recovery rate and product cost reduction.

Description

technical field [0001] The present invention is a kind of production method of calcium chloride dihydrate Background technique [0002] Calcium chloride dihydrate is an important raw material for the manufacture of anhydrous calcium chloride. Anhydrous calcium chloride is widely used because of the following characteristics. It has the characteristics of heat generation and low freezing point when it meets water, and is usually used for snow melting and deicing of roads, highways, parking lots, and docks. It also has the function of strong water absorption, and can also be used as a desiccant, such as for the drying of nitrogen, oxygen, hydrogen, hydrogen chloride, sulfur dioxide and other gases. It is the best material for defog removal in ports, dust collection on road surfaces, and fabric fire prevention. Used as a dehydrating agent in the production of alcohols, esters, ethers and acrylic resins. Calcium chloride aqueous solution is an important refrigeration medium ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C01F11/28
Inventor 史洪义
Owner TIANJIN LIHONG CHEM TECHN
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com