Method for producing sodium carboxymethylcellulose from waste coated paper

A technology of sodium carboxymethyl cellulose and coating, applied in papermaking, paper recycling, waste paper processing, etc., to achieve low production costs, realize resource regeneration, and protect the ecological environment

Inactive Publication Date: 2008-12-17
北京盖雅技术中心有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The practice of producing CMC with coated broken paper has not been reported at home and abroad

Method used

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  • Method for producing sodium carboxymethylcellulose from waste coated paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 8.3g of the coated broken paper dry material pretreated by hydrochloric acid, add 100mL of sodium hydroxide solution with a mass concentration of 18%, stir continuously at room temperature for 45min, filter the alkali cellulose with a filter press, and reuse the filtered alkali solution Add alkali fiber in the reaction flask, add 120mL mass concentration of 95% ethanol and stir, then add 8.9g monochloroacetic acid and 30mL mass concentration of 95% ethanol mixed solution, react at 40°C for 1 After 1 hour, heat up to 75°C and react for 3 hours; adjust the pH value to neutrality with dilute hydrochloric acid; wash three times with ethanol with a mass concentration of 75%, and wash once with ethanol with a mass concentration of 95%; dry the product, and the waste ethanol solution is distilled back to use; finally the product is dried and pulverized.

Embodiment 2

[0027] Take 1Kg of the coated broken paper dry material pretreated by sulfuric acid, add 12L of sodium hydroxide solution with a mass concentration of 20%, stir continuously at room temperature for 45min, filter the alkali cellulose with a filter press, and reuse the filtered alkali liquor; Add the alkali fiber into the reactor, add 15L of ethanol with a mass concentration of 95% and stir well, then add 14Kg of monochloroacetic acid and 4L of ethanol with a mass concentration of 95%, and react at 40°C for 1.5 hours. Raise the temperature to 75°C and react for 3.5 hours; adjust the pH value to neutral with dilute hydrochloric acid; wash three times with ethanol with a mass concentration of 75%, and wash once with ethanol with a mass concentration of 95%; dry the product, and reuse the waste ethanol solution through distillation; Finally the product is dried and pulverized.

Embodiment 3

[0029] Take 9g of the dry coated broken paper pretreated by hydrochloric acid, add 120mL of 85% alcohol, mix well, add 8g of sodium hydroxide solid, stir continuously at 45°C for 90min, then add 11.5g of monochloroacetic acid and 30mL of mass concentration A solution mixed with 95% ethanol was reacted at 40°C for 1.0 hour, and then heated to 60°C for 3.5 hours; the pH value was adjusted to neutral with dilute hydrochloric acid; washed three times with 75% ethanol at a mass concentration of 95% % ethanol for washing once; the product is dried, and the waste ethanol solution is reused through distillation; finally, the product is dried and pulverized.

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Abstract

The invention provides a method which is used for producing sodium carboxymethyl cellulose with raw materials of broken coating paper, comprises the steps of raw material preprocessing, alkalizing, (filter pressing), etherifying, neutralizing, alcohol washing, spin drying, parching and smashing, and a water ratio of used papermaking sludge is equal to or less than 80 percent and fiber content is equal to or more than 80 percent (mass fraction). The method has the raw materials from wastes in papermaking industries, concise techniques and steps, and low production cost, and does not generate secondary pollution. The method provided by the invention opens up new approaches for the reclamation of the broken coating paper. The invention further relates to recycled products that are obtained by the method which is used for producing the sodium carboxymethyl cellulose.

Description

Technical field: [0001] The present invention relates to the production method of sodium carboxymethyl cellulose, especially relate to the method for producing sodium carboxymethyl cellulose with coated broken paper as raw material. technical background: [0002] Broken paper refers to partially or fully manufactured paper or paperboard that is discarded at any point in the papermaking, coating or finishing sections of a paper mill. It includes wet broken paper and dry broken paper. Wet broke is collected from the forming and press sections; dry broke from the dryer, calender, reel, winder, coater and finishing section. Broken paper, as a type of secondary fiber, is often reused in the papermaking process. Coated broken paper is a special kind of broken paper, the fiber part of which is severely horny, the uniformity and bonding ability are reduced, and it is difficult to disintegrate; the coating contains a large amount of anionic garbage such as adhesives and surfactants...

Claims

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Application Information

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IPC IPC(8): D21C5/02
CPCY02W30/64
Inventor 吴绍祖倪晋仁何霄嘉王玉枝
Owner 北京盖雅技术中心有限公司
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