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Cellulose ether production technology

A production process and technology of cellulose ether, applied in the field of fiber product processing, can solve the problems of lye waste, refined cotton explosion, increase fiber manufacturing cost, etc., and achieve the effects of reducing production cost, reducing usage, and improving utilization rate

Active Publication Date: 2017-03-22
山东洲星生物技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, during the dehydration process, the black impurity liquid released from the fiber raw materials has a high content of passing lye. If this part of lye is directly discharged, it will not only fail to meet environmental protection standards, but also cause a lot of waste of lye, which increases production costs. ; At the same time, in the process of rinsing, since there is still a large amount of lye in the fiber after dehydration, because a large amount of water is needed for multiple rinsing, until the rinsing is clean
The current rinsing process is realized through the bleaching tank. The fibers are placed in the bleaching tank and rinsed multiple times through a large amount of running water. The water after rinsing meets the environmental protection standard and is directly discharged. If it does not meet the standard, it will be treated by the sewage treatment device. The bleaching method here not only causes a lot of waste of water resources, but also increases the manufacturing cost of the fiber. In addition, in the bleaching tank, the agitation of the fiber is usually realized by the propeller, and the bleaching effect of the fiber is promoted by agitating the fiber, but due to the propulsion The rotating speed of the machine is relatively slow. When a large amount of fibers are placed in the bleaching tank, the bleaching effect is not ideal, which increases the difficulty and frequency of bleaching, and further increases the amount of bleaching water.
[0004] In the prior art, the pulverization of refined cotton is usually dry pulverization, but there are the following problems in the process of dry pulverization of refined cotton: (1) refined cotton is easy to cause explosion during dry pulverization; (2) in the process of dry pulverization of refined cotton, A large amount of heat will be generated during the pulverization of refined cotton, thereby destroying the degree of polymerization of refined cotton; (3) The pulverized refined cotton is relatively bulky, difficult to measure, and it is difficult to add refined cotton accurately, and it is very uncomfortable when it is put into the reactor. convenient

Method used

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  • Cellulose ether production technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] a) Refined:

[0034] 1) Batching, the lye is configured in the batching device. The lye used is NaOH solution with a mass percentage concentration of 27%. The cotton linters that need to be cooked with lye are placed in the steaming ball. The lye is delivered to the steaming ball;

[0035] 2) Cooking, high-temperature cooking is performed on the fibers soaked in alkali solution through steaming balls. The temperature of high-temperature cooking is 350°C. The fiber in the liquid is cooked at high temperature, and after the cooking is completed, the fiber slurry containing the lye is discharged into the half pulper together;

[0036] 3) In the half pulper, the fiber is stirred by the stirring blade inside the half pulper to make it cool again. During the cooling process, the fiber and lye are separated by the separation mechanism inside the half pulper at 390r / min Centrifugal detachment of the lye at a high speed; the slurry is cooled, pressed, and dried by the half pul...

Embodiment 2

[0044] a) Refined:

[0045] 1) Batching, the lye is configured in the batching device. The lye used is a NaOH solution with a mass percentage concentration of 26%. The cotton linters that need to be cooked with lye are placed in the steaming ball. The lye is delivered to the steaming ball;

[0046] 2) Cooking, the fiber soaked in the lye is cooked at high temperature by steaming balls, the temperature of high-temperature cooking is 280°C, after the cooking is completed, it is initially cooled, and then discharged into the semi-pulper; The fiber in the liquid is cooked at high temperature, and after the cooking is completed, the fiber slurry containing the lye is discharged into the half pulper together;

[0047] 3) In the half pulper, the fiber is stirred by the stirring blade inside the half pulper to make it cool again. During the cooling process, the fiber and lye are separated by the separation mechanism inside the half pulper at 380r / min Centrifugal detachment of the ly...

Embodiment 3

[0055] a) Refined:

[0056] 1) Batching, the lye is configured in the batching device. The lye used is NaOH solution with a mass percentage concentration of 29%. The cotton linters that need to be cooked with lye are placed in the steaming ball. The lye is delivered to the steaming ball;

[0057] 2) Cooking, high-temperature cooking is performed on the fiber soaked in lye by steaming balls. The temperature of high-temperature cooking is 450°C. The fiber in the liquid is cooked at high temperature, and after the cooking is completed, the fiber slurry containing the lye is discharged into the half pulper together;

[0058] 3) In the half pulper, the fiber is stirred by the stirring blade inside the half pulper to make it cool again. During the cooling process, the fiber and lye are separated by the separation mechanism inside the half pulper at 410r / min Centrifugal detachment of the lye at a high speed; the slurry is cooled, pressed, and dried by the half pulper, and then the ...

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Abstract

The invention discloses a cellulose ether production technology and belongs to the technical field of fiber product processing. The cellulose ether production technology comprises refining, pulverization, etherification, separation and drying and is characterized in that the pulverization process comprises pre-mixing refined cotton produced in the refining process and an etherification agent according to a mass ratio of 62 to 74: 20 for 3-7min, feeding the mixed refined cotton into a wet crushing mill, carrying out crushing to obtain crushed refined cotton, individually and directly feeding the crushed refined cotton into a reactor in the etherification process, and carrying out an etherification reaction process. In the process of crushing, the refined cotton is in a special semi-wet state and the semi-wet state can ensure less heat and high safety in crushing so that the risk of explosion is avoided, a polymerization degree of the refined cotton is not destroyed and the quality of the product cellulose ether is improved.

Description

technical field [0001] A production process of cellulose ether belongs to the technical field of fiber product processing. Background technique [0002] Cellulose ether is a polymer compound that can be dissolved in water, dilute alkali solution and organic solvent, and has thermoplasticity and excellent performance. It is widely used in construction, cement, petroleum, food, textile, detergent, paint, medicine, papermaking and electronic components industries. The preparation process of cellulose ether includes fiber refining and crushing steps. [0003] At present, most fiber products are usually soaked in lye, and then the colloid, lignin and other impurities on the surface of the raw material for fiber production are removed by steaming. After steaming, dehydration and rinsing are required. refined. Among them, during the dehydration process, the black impurity liquid released from the fiber raw materials has a high content of lye. If this part of lye is directly disc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B11/00C08B11/22
CPCC08B11/00C08B11/22
Inventor 王国星王芹
Owner 山东洲星生物技术有限公司