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Method for manufacturing snowmelt agent by using shells

A snow-melting agent, shell technology, applied in chemical instruments and methods, calcium/strontium/barium halide, other chemical processes, etc., to achieve the effects of less secondary pollution, simple synthesis route, and improved economic value

Inactive Publication Date: 2010-02-24
ZHANGZIDAO GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These shells have to be transported to the designated landfill for landfill disposal, which brings a huge economic burden to the city

Method used

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  • Method for manufacturing snowmelt agent by using shells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Using pure concentrated hydrochloric acid and shells as raw materials to prepare chlorine salt type deicing agent:

[0020] Its reaction formula is: CaCO 3 +2HCl=CaCl 2 +H 2 O+CO 2

[0021] The first step is shell pretreatment: shells include all shells, such as oyster shells, clam shells, conch shells, scallop shells, abalone shells, single-species shells or mixed-species shells. Use clean water to remove dirt and other sundries on the surface of the shells, then crush them, and store the powdered shell powder separately for later use. The particle size of the shells after crushing is controlled at 16-20 mesh.

[0022] The second step reaction stage: take 1.06 parts of crushed shell particles (containing 1 part of calcium carbonate) and add them to the reactor, slowly add concentrated hydrochloric acid (mass concentration 36%) under stirring conditions, and react 2-3 times under stirring conditions. Hours, then add powdered shells to adjust the pH to neutral;

[...

Embodiment 2

[0027] Preparation of Chloride-Salt Deicing Agent from Waste Hydrochloric Acid and Shells

[0028] The deicing agent is prepared according to the method described in Example 1. The specific raw materials are 1.06 parts of pulverized shell particles (containing 1 part of calcium carbonate) and 2.46 parts of concentrated hydrochloric acid (mass concentration 30%), which is dried to obtain calcium chloride-based Solid powder deicing agent products.

Embodiment 3

[0030] Preparation of Acetate Deicing Agent from Glacial Acetic Acid and Shells

[0031] Its reaction equation is: 2CH 3 COOH+CaCO 3 =(CH 3 COO) 2 Ca+H 2 O+CO 2

[0032] According to the preparation method described in Example 1, the acetate type deicing agent is prepared, and the specific raw material is that 1.06 parts of pulverized shell particles (containing 1 part of calcium carbonate) are added to 1.21 parts of glacial acetic acid (content 99%), and the reaction control temperature is at 80 Stir and react at ℃ for 2 hours, the filtrate is evaporated and concentrated to a viscous state, and dried to obtain a solid powder snow-melting agent product mainly composed of calcium acetate.

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Abstract

The invention relates to a method for manufacturing snowmelt agent, also is a method for manufacturing snowmelt agent by using shells, which uses shells and muriatic acid or acetic acid as raw materials for reaction and obtains the snowmelt agent after filteration, concentration and crystallization. The invention has simple synthesized route, and the production process has the advantages of no pollution, comprehensive recycled utilization, less secondary pollution in the production process, greatly lowered noise, low leakage of dust and controllable and environment-friendly production process.As the main ingredient of the shells is calcium carbonate, marine products for processing waste shells are taken as raw materials to manufacture environment-friendly calcium chloride or calcium acetate snowmelt agent, so that the environment pollution problem of processing waste shells by using marine products can be solved, the economic value of the marine product for processing waste shells isgreatly enhanced, and byproduct carbon dioxide is obtained. If shells and waste acid are used for reaction to manufacture snowmelt agent, the economic value of the waste acid can be improved.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of marine product waste and chemical production, and in particular relates to a method for producing deicing agent by using shells discarded during marine product processing as raw materials. Background technique [0002] Snow melting agent (road freezing prevention agent) is mainly used for road, airport, port, city street winter snow removal and road antifreeze. There are generally two types of snow-melting agents used at home and abroad: one is the snow-melting agent with acetate as the main component. This type of snow-melting agent has a good snow-melting effect and no corrosion damage, but its price is high (more than 10,000 yuan per ton) , Generally used for snow melting and deicing in important places such as airports. The other type is deicing agent with "chloride salt" as the main component, such as sodium chloride, calcium chloride, magnesium chloride, potassium chlor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/18C01F11/28C01F11/30
Inventor 马伟辛丘岩王刃程子洪秦承欢杨港赵南南田丽妍肖莉莉林燕兰姜晨于浩
Owner ZHANGZIDAO GRP
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