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A kind of method that prepares polyhexamethylene monoguanidine hydrochloride by waste acid lye

A technology of polyhexamethylene monoguanidine hydrochloride and waste hydrochloric acid, which is applied in the field of sterilizing polymer preparation, can solve environmental pollution and other problems, and achieve the effects of high economic value, pollution reduction and low price

Active Publication Date: 2020-07-03
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the waste liquid is not handled properly, it will cause serious environmental pollution

Method used

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  • A kind of method that prepares polyhexamethylene monoguanidine hydrochloride by waste acid lye

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Determination of the concentration of spent acid and alkali

[0025] 1) At first use 0.5mol / L hydrochloric acid standard solution and sodium hydroxide standard solution to carry out acid-base titration to waste liquid ammonia and waste hydrochloric acid solution, record the concentration of waste ammonia water to be 1.756mol / L, and the concentration of waste hydrochloric acid is 0.872mol / L. Among them, the waste ammonia water is prepared by absorbing the ammonia waste gas produced in the enterprise's production with deionized water; the waste hydrochloric acid is prepared by absorbing the hydrogen chloride waste gas produced in the enterprise's production with deionized water.

[0026] 2) Preparation of Ammonium Chloride

[0027] According to the volume ratio of 1:2, take 100mL of waste ammonia water and 200mL of waste hydrochloric acid solution, pour the waste ammonia solution into the waste hydrochloric acid solution, stir, and expose to the sun for a few days; or put...

Embodiment 2

[0037] The method for preparing polyhexamethylene monoguanidine hydrochloride by waste acid lye comprises the following steps:

[0038] 1) Preparation of ammonium chloride: use hydrochloric acid standard solution and sodium hydroxide standard solution to carry out acid-base titration to waste ammonia water and waste hydrochloric acid solution, record the concentration of waste ammonia water and waste hydrochloric acid, and then use a molar ratio of 1:1 to mix waste Slowly pour the ammonia solution into the waste hydrochloric acid solution; stir to obtain the ammonium chloride solution; the waste ammonia water is prepared by absorbing the ammonia waste gas produced in the production of the enterprise with deionized water; the waste hydrochloric acid is absorbed by the hydrogen chloride waste gas produced in the production of the enterprise with deionized water preparation.

[0039] 2) Place the ammonium chloride solution generated under the sun for a few days; or place the ammo...

Embodiment 3

[0043] The method for preparing polyhexamethylene monoguanidine hydrochloride by waste acid lye comprises the following steps:

[0044] 1) Preparation of ammonium chloride: use hydrochloric acid standard solution and sodium hydroxide standard solution to carry out acid-base titration of ammonia water and hydrochloric acid solution, measure the concentration of ammonia water and hydrochloric acid, then slowly pour the waste ammonia solution into In waste hydrochloric acid solution; Stir to obtain ammonium chloride solution;

[0045] 2) The ammonium chloride solution is placed on a heating plate to be heated and evaporated, and ammonium chloride crystals are separated out, filtered, and dried, and its purity is determined by the formaldehyde method, and the purity is 99.1%;

[0046]3) Feed the generated ammonium chloride, dicyandiamide, and hexamethylenediamine into the reactor at a molar ratio of 1.85:1:2, heat up under mechanical stirring, and react at 200°C until no ammonia g...

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Abstract

The invention relates to a method for preparing polyhexamethylene monoguanidine hydrochloride from waste acid lye, comprising the following steps: preparing ammonium chloride: measuring the concentration of waste ammonia water and waste hydrochloric acid, and mixing Slowly pour waste ammonia solution into waste hydrochloric acid solution; stir to obtain ammonium chloride solution, separate out ammonium chloride crystals, filter, and dry; ammonium chloride, dicyandiamide, hexamethylenediamine molar ratio (1.75-2): 1: 2 Feed into the reaction kettle, stir, and react at 150-200°C to obtain white polyhexamethylene monoguanidine hydrochloride powder. The advantages are: the raw material is the waste acid and alkali liquid produced in the production of the enterprise, the price is low, the recycling value of the waste liquid is realized, the treatment of the waste liquid is reduced, and the pollution is reduced; the preparation process of polyhexamethylene monoguanidine is simple, the technology Ripe and easy to produce industrially. The technical route has the characteristics of low cost and high economic value.

Description

technical field [0001] The invention belongs to the field of polymer preparation for sterilization, and in particular relates to a method for preparing polyhexamethylene monoguanidine hydrochloride from waste acid and alkali liquor. Background technique [0002] The raw material polyhexamethylene monoguanidine hydrochloride is a new generation of green and high-efficiency disinfectant recognized internationally. In 2010, it was listed by the National Standards Committee of my country as being applicable to food, the environment and the surface of objects, human body, air and central air conditioning. In the list of disinfectant raw materials for the ventilation system, its safety has been approved by the US FDA and EPA. It is widely used in industry, agriculture, medicine and daily life. Its preparation method has a long history. In various methods for preparing polyhexamethylene monoguanidine hydrochloride, waste gas ammonia will be generated. [0003] Ammonia gas cannot b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/00
CPCC08G73/00
Inventor 贾宏敏于洪梅全艳玲宋伟孙晓龙
Owner UNIV OF SCI & TECH LIAONING
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