CN1136569A - Preparing method for carboxymethyl cellulose - Google Patents
Preparing method for carboxymethyl cellulose Download PDFInfo
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- CN1136569A CN1136569A CN 95111052 CN95111052A CN1136569A CN 1136569 A CN1136569 A CN 1136569A CN 95111052 CN95111052 CN 95111052 CN 95111052 A CN95111052 A CN 95111052A CN 1136569 A CN1136569 A CN 1136569A
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- carboxymethyl cellulose
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- caustic soda
- preparation
- alcoholic solution
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Abstract
The invented method puts the wood pulp of conifer and alcoholic solution of caustic soda in the kneading machine to make basic cellulose, then addes monochloroacetic acid to proceed etherization, the resultant is washed with dilute alcohol, then the finished product of carboxymethyl cellulose is obtained after filter pressing, oven drying and crushing. The product prepared by said invention is white colour or light yellow powder, the viscosity is 50-100 centipoise. The paper made from said product features high strength, the oil resistant and good ink absorbing properties.
Description
The present invention relates to a kind of preparation method of carboxymethyl cellulose, relate in particular to a kind of preparation method of paper grade (stock) carboxymethyl cellulose, belong to organic chemistry filed.
At present, the preparation method of carboxymethyl cellulose is: pulp fibers is made soda cellulose with the caustic soda alcoholic solution in kneading machine, add monochloroacetic acid then and carry out etherificate, the gained material washs with Diluted Alcohol, promptly gets the carboxymethyl cellulose finished product through press filtration, oven dry, pulverizing again.Because the raw material pulp fibers poor performance that adopts in the preparation process, the therefore carboxymethyl cellulose viscosity height of making (300-600 centipoise), and outward appearance be a yellow, and the paper whiteness made from this product is low, intensity is low, oil-proofness and ink receptivity are poor.Can only be applicable to building materials and other industry.
The object of the present invention is to provide a kind of outward appearance whiteness height, viscosity is low, internal performance is excellent, can be applicable to the preparation method of a kind of high-grade carboxymethyl cellulose of making high-grade paper.
The present invention is achieved in that a kind of preparation method of carboxymethyl cellulose, pulp fibers is made soda cellulose with the caustic soda alcoholic solution in kneading machine, add monochloroacetic acid then and carry out etherificate, the gained material washs with Diluted Alcohol, promptly get carboxymethyl cellulose through dehydration, oven dry, pulverizing again, be characterized in that used slurry cypress fiber is a softwood pulp.
Compare with the preparation method of existing carboxymethyl cellulose, the present invention is owing to the pulp fibers that has replaced with softwood pulp in the former technology, therefore carboxymethyl cellulose viscosity low (50-100 centipoise) outward appearance that makes is white in color or pale yellow powder, excellent product performance, the paper strength height that makes with this product, paper oil-proofness and ink receptivity are good, applicable to high-grade paper such as paper industry manufactured copper paperboard, white board, coatings.
Fig. 1 is a process flow sheet of the present invention.
Below in conjunction with accompanying drawing the present invention is made a detailed description:
As shown in Figure 1, the present invention is placed on the softwood pulp chopping in the kneading machine, drip the caustic soda alcoholic solution and alkalize, constantly stir therebetween, the dropping time was controlled at 0.5-1.5 hour, dripping the back stirred 1-2 hour, alkali fiber is made in reaction, drips monochloroacetic acid then and carries out etherificate, and the dropping time was controlled at 0.5-1 hour, drip post-heating to 75-85 ℃, stirred 1-2 hour.The material that makes is put into neutralization bucket with Diluted Alcohol washing, with hydrochloric acid transfer pH value to 6.5-7.5 extremely.Through the pressure filter press filtration, rake formula distilling machinery distills unnecessary ethanol again, and drying machine drying, pulverizer are pulverized and promptly got carboxymethyl cellulose.Its chemical reaction is as follows:
The alcohol that alcohol that filtrate after the pressure filter press filtration therebetween makes through fractionation and the distillation of rake formula make is all recyclable.
Main raw material of the present invention and consumption:
The title specification consumes (kilogram/ton)
Softwood pulp DP300-500 800
Monochloroacetic acid 95% 450
Solid caustic soda 95% 200
Liquid caustic soda 45% 600
Alcohol 95% 700
Basic mechanical design feature index of the present invention:
Nx-100 Nx-50
Viscosity≤100 centipoise viscosity≤50 centipoises
Replacement degree 〉=0.80 replacement degree 〉=0.80
Muriate≤5% muriate≤5%
PH value 6.5-7.5 pH value 6.5-7.5
Moisture content≤10% moisture content≤10%
Claims (2)
1, a kind of preparation method of carboxymethyl cellulose, be that pulp fibers is made alkali fiber with the caustic soda alcoholic solution in kneading machine, add monochloroacetic acid then and carry out etherificate, the gained material washs with Diluted Alcohol, promptly get the carboxymethyl cellulose finished product through press filtration, oven dry, pulverizing again, it is characterized in that used pulp fibers is a softwood pulp.
2, the preparation method of a kind of carboxymethyl cellulose according to claim 1, the dropping time that it is characterized in that the caustic soda alcoholic solution was controlled at 0.5-1.5 hour, stirred 1-2 hour, and the dropping time of monochloroacetic acid was controlled at 0.5-1 hour, drip and finish post-heating, stirred 1-2 hour to 75-85C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95111052 CN1136569A (en) | 1995-05-23 | 1995-05-23 | Preparing method for carboxymethyl cellulose |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95111052 CN1136569A (en) | 1995-05-23 | 1995-05-23 | Preparing method for carboxymethyl cellulose |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1136569A true CN1136569A (en) | 1996-11-27 |
Family
ID=5078370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95111052 Pending CN1136569A (en) | 1995-05-23 | 1995-05-23 | Preparing method for carboxymethyl cellulose |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1136569A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1312184C (en) * | 2000-11-01 | 2007-04-25 | Bki控股公司 | Cellulose ethers and method of preparing the same |
| CN101081872B (en) * | 2007-06-07 | 2010-05-26 | 北京理工大学 | Low bath ratio kneading method production of polyanion cellulose |
| CN103437233A (en) * | 2013-09-11 | 2013-12-11 | 顾德芹 | Polyacrylonitrile pulp type fibers as well as preparation method thereof |
-
1995
- 1995-05-23 CN CN 95111052 patent/CN1136569A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1312184C (en) * | 2000-11-01 | 2007-04-25 | Bki控股公司 | Cellulose ethers and method of preparing the same |
| CN101081872B (en) * | 2007-06-07 | 2010-05-26 | 北京理工大学 | Low bath ratio kneading method production of polyanion cellulose |
| CN103437233A (en) * | 2013-09-11 | 2013-12-11 | 顾德芹 | Polyacrylonitrile pulp type fibers as well as preparation method thereof |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |