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Method for corn straw modification

A technology for modifying corn stalks, which is applied in the field of chemical modification of corn stalks with chemical agents, can solve the problems of incomplete crude carboxymethyl cellulose technology, inability to uniformly penetrate chloroacetic acid, poor corrosion resistance, etc., and achieve rich The effect of application route, low production cost and easy availability of raw materials

Inactive Publication Date: 2009-10-07
SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the technology of preparing crude carboxymethyl cellulose by modifying crop straw is not complete enough, we must find a new process suitable for my country's CMC manufacturing to meet their needs.
Carboxymethyl cellulose is produced by conventional methods, due to the presence of a large amount of alkali, and the affinity of sodium chloroacetate to cellulose is much smaller than that of alkali to cellulose, so chloroacetic acid cannot penetrate evenly into the interior of cellulose
As a result, there are great side reactions, poor transparency, small salt-to-viscosity ratio, and poor corrosion resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Preparation of corn stalk powder: Rinse the dried fresh corn stalks with deionized water, cut them into 2-3 cm pieces, place them in a tray for drying in an oven at 90°C, pulverize them with a grinder, pass through a 60-mesh sieve, stand-by;

[0025] 2) Stir 100 grams of corn stalk powder and 1000 milliliters of sodium hydroxide solution in step 1) at 70° C. for 4 hours, then filter the alkali boiling liquid through a 120-mesh screen, rinse the filter residue three times with deionized water, and set aside;

[0026] 3) Step 2) After filtering, add 100 ml of sodium hydroxide solution and 30 ml of ethanol solution to the filter residue and react at 30°C for 45 minutes, and the reacted mixed solution is ready for use;

[0027] 4) Add 50 milliliters of ethanol solution and 30 milliliters of chloroacetic acid solution to the mixed solution in step 3), and react for 2 hours at 80° C., then add 20 milliliters of sodium hydroxide solution and 30 milliliters of ethanol soluti...

Embodiment 2

[0032] The difference from Example 1 is:

[0033] 1) Preparation of corn stalk powder: Rinse the dried fresh corn stalks with deionized water, cut them into 2-3 cm pieces, place them in a tray for drying in an oven at 80°C, pulverize them with a grinder, pass through a 80-mesh sieve, stand-by;

[0034] 2) Stir 150 grams of corn stalk powder in step 1) and 800 milliliters of sodium hydroxide solution at 90°C for 6 hours, then filter the alkali boiling liquid through a 100-mesh screen, rinse the filter residue 5 times with deionized water, and set aside ;

[0035] 3) Step 2) After filtering, add 50 ml of sodium hydroxide solution and 50 ml of ethanol solution to the filter residue and react at 40°C for 60 minutes, and the reacted mixed solution is ready for use;

[0036] 4) Add 70 milliliters of ethanol solution and 50 milliliters of chloroacetic acid solution to the mixed solution in step 3), and react for 1 hour at 90° C., then add 50 milliliters of sodium hydroxide solution...

Embodiment 3

[0040] The difference from Example 1 is:

[0041] 1) Preparation of corn stalk powder: Rinse the dried fresh corn stalks with deionized water, cut them into 2-3 cm pieces, place them in a tray for drying in an oven at 70°C, pulverize them with a grinder, pass through a 100-mesh sieve, stand-by;

[0042] 2) Stir 200 grams of corn stalk powder in step 1) and 900 ml of sodium hydroxide solution at 80°C for 5 hours, then filter the alkali boiling liquid through a 140-mesh screen, rinse the filter residue 4 times with deionized water, and set aside ;

[0043] 3) Step 2) After filtering, add 80 ml of sodium hydroxide solution and 40 ml of ethanol solution to the filter residue and continue to react at 20° C. for 30 minutes, and the reacted mixed solution is ready for use;

[0044] 4) Add 100 milliliters of ethanol solution and 40 milliliters of chloroacetic acid solution to the mixed solution in step 3), and react for 80 minutes at 70° C., then add 40 milliliters of sodium hydroxi...

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Abstract

The invention relates to a method for corn straw modification, in particular to a method for chemical modification to corn straws by using a chemical preparation. The method comprises the following steps: dry corn straws are washed by deionized water, cut into broken pieces and dried and crushed, the crushed corn straws are stirred with 800-1000 ml of sodium hydroxide solution for 4-6 hours at the temperature of 70-90 DEG C and then are filtered and washed, the filter residue is added with 50-100 ml of sodium hydroxide solution and 20-50 ml of ethanol solution after filtration and then reacts for 30-60 minutes at the temperature of 20-40 DEG C, the mixed liquor after reaction is added with 50-100 ml of ethanol solution and 30-50 ml of chloroacetic acid solution and reacts for 1-2 hours at the temperature of 70-90 DEG C and then is added with 20-50 ml of sodium hydroxide solution and 30-50 ml of ethanol solution, and the mixed liquor is cooled after being maintained for 60-100 minutes and then is titrated to be neutral with hydrochloric acid, filtered and washed with ethanol. The preparation method can be realized in the ordinary laboratory, a large-scale instrument is not required, the reaction conditions are accessible, the raw materials have low price and are easily obtained and the experimental wastewater can be reused.

Description

technical field [0001] The invention relates to a method for modifying corn stalks, in particular to a method for chemically modifying corn stalks with chemical agents. Background technique [0002] my country is rich in crop straw resources, and the annual output of corn straw as an agricultural by-product reaches hundreds of millions of tons. However, the use of corn stalks in traditional agriculture and simple reproduction is only for cooking, raising livestock, building houses, heating and fertilizing fields. With the development of modern agriculture and modern processing technology, scientists have a new change in their understanding of crop straw, which is an important agricultural product like seeds. Compared with developed countries, although my country has carried out the development and utilization of straw in related fields, the level of comprehensive utilization of straw is still relatively low, research and promotion are out of touch, and a large number of val...

Claims

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Application Information

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IPC IPC(8): C08B11/12
Inventor 刘作新苗永刚
Owner SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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