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Preparation and application of carboxymethyl cellulose of wheat straw

A technology of carboxymethyl cellulose and wheat straw, applied in chemical instruments and methods, water/sludge/sewage treatment, water pollutants, etc., can solve pollution, plant straw incineration, waste of resources and other environmental problems, and achieve adsorption Large capacity, reuse, and clear wastewater

Inactive Publication Date: 2011-03-16
GANSU TIPTOP PLANT TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, a considerable part of plant stalks are burned, causing waste of resources and environmental pollution

Method used

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  • Preparation and application of carboxymethyl cellulose of wheat straw
  • Preparation and application of carboxymethyl cellulose of wheat straw
  • Preparation and application of carboxymethyl cellulose of wheat straw

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Preparation of wheat straw carboxymethyl cellulose (WSC)

[0038] Mix 15 g of wheat straw powder and 200 mL of ethanol with a mass concentration of 95% evenly, add 12 g of sodium hydroxide, stir and alkalize at room temperature for 2 h, then add 100 mL of ethanol with a mass concentration of 95%, 8 g of a mass concentration of 10 % aqueous solution of chloroacetic acid, heated to 50°C, reacted for 30 min; then added 50 mL of sodium hydroxide ethanol solution (dissolve 5 g of sodium hydroxide in 100 mL of ethanol with a mass concentration of 90%), The temperature was raised to 90°C, and the etherification was carried out at constant temperature for 100 min to obtain the crude product. Neutralize the crude product with 2 mol / L hydrochloric acid at 50°C to pH = 7.0-8.0, filter with suction, wash with ethanol with a mass concentration of 95%, filter with suction, and dry at 70-100°C for 2-5 h. Wheat straw carboxymethyl cellulose (WSC) was obtained.

[0039] (2) Prepar...

Embodiment 2

[0042] (1) Preparation of wheat straw carboxymethyl cellulose (WSC)

[0043]Mix 10 g of wheat straw powder and 200 mL of 80% ethanol evenly, add 10 g of sodium hydroxide, stir the alkali at room temperature for 1.5 h, then add 100 mL of 80% ethanol, 5 g of 30% ethanol The aqueous solution of chloroacetic acid was heated to 70°C and reacted for 20 min; then, 50 mL of sodium hydroxide ethanol solution (a solution formed by dissolving 5 g of sodium hydroxide in 100 mL of ethanol with a mass concentration of 80%) was added, and the temperature was raised to Etherification at constant temperature at 70°C for 80 min to obtain the crude product. Neutralize the crude product with 1 mol / L hydrochloric acid at 70°C to pH = 7.0-8.0, filter with suction, wash with ethanol with a mass concentration of 80%, filter with suction, and dry at 70-100°C for 2-5 h. Wheat straw carboxymethyl cellulose (WSC) was obtained.

[0044] (2) Preparation of wheat straw carboxymethyl cellulose-based adsorb...

Embodiment 3

[0047] (1) Preparation of wheat straw carboxymethyl cellulose (WSC)

[0048] Mix 5 g of wheat straw powder and 50 mL of ethanol with a mass concentration of 50% evenly, add 5 g of sodium hydroxide, stir and alkalize at room temperature for 1 h, then add 50 mL of ethanol with a mass concentration of 50%, 5 g of a mass concentration of 50% % chloroacetic acid aqueous solution, heated to 70°C, reacted for 20 min; then added 50 mL of sodium hydroxide ethanol solution (dissolve 5 g of sodium hydroxide in 100 mL of ethanol with a mass concentration of 50%), The temperature was raised to 70°C, and the etherification was carried out at constant temperature for 90 min to obtain the crude product. Neutralize the crude product with 1 mol / L hydrochloric acid at 50°C to pH = 7.0-8.0, filter with suction, wash with ethanol with a mass concentration of 50%, filter with suction, and dry at 70-100°C for 2-5 h. Wheat straw carboxymethyl cellulose (WSC) was obtained.

[0049] (2) Preparation o...

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Abstract

The invention discloses carboxymethyl cellulose of wheat straw. The wheat straw is crushed and subjected to pretreatment with dilute alkali, bleaching and alkalization, and then reacts with chloroacetic acid before being etherified so as to obtain the carboxymethyl cellulose of the wheat straw; and the carboxymethyl cellulose of the wheat straw is subjected to graft copolymerization together with acrylic acid to obtain a carboxymethyl cellulose-based polymer adsorbent. The adsorbent is applied to the treatment of wastewater containing heavy metal ions, has high adsorbability and large adsorption capacity and ensures high metal ion removal rate. After treatment, the adsorbent has high stability and can completely meet the requirements of heavy-metal wastewater treatment; and the treated wastewater is clear and transparent without odor and can meet the national emission standard. The invention has the advantage that the resources of raw materials are wide, the cost is low, the use of waste is realized, and secondary pollution caused by burning of the wheat straw is avoided, thus being conducive to environmental protection.

Description

technical field [0001] The invention belongs to the technical field of polymer adsorbents, and relates to the preparation of carboxymethyl cellulose, in particular to the preparation of wheat straw carboxymethyl cellulose. The invention also relates to the application of the wheat straw carboxymethyl cellulose as a polymer adsorbent in removing heavy metal ions after graft copolymerization. Background technique [0002] Cellulose is one of the most abundant organic compounds in nature. Because cellulose molecules are linear molecules, with high crystallinity, dense arrangement and poor water solubility, their processing and application are seriously affected. Carboxymethyl cellulose is its most important modified product. It has good water solubility and is also an important reaction intermediate. Therefore, the development and application of its properties are becoming more and more extensive, and it has become an important factor in the development of superabsorbent resins...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B11/12C08F251/02B01J20/24B01J20/30C02F1/62C02F101/20
Inventor 何玉凤张玲宴得珍王华王荣民
Owner GANSU TIPTOP PLANT TECH CORP
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