Method and apparatus for evaluating cellulose pulp reaction performance

A technology of cellulose pulp and reaction performance, applied in the direction of measuring devices, flow characteristics, instruments, etc., can solve problems such as errors, complicated procedures, and long processes

Active Publication Date: 2013-03-13
NANTONG CELLULOSE FIBERS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Defects of the prior art: (1) judge whether it has good reaction performance by various routine tests
The method has a long flow and complicated procedures; certain errors occur in the process of preparing the product and in

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  • Method and apparatus for evaluating cellulose pulp reaction performance
  • Method and apparatus for evaluating cellulose pulp reaction performance
  • Method and apparatus for evaluating cellulose pulp reaction performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] (1) Add 160g of acetic anhydride, 240g of acetic acid and 12g of sulfuric acid into the reaction kettle (cylindrical, 1L volume), the volume reaches 2 / 3~3 / 4 of the volume of the reaction kettle, and the mass ratio of acetic anhydride, acetic acid and sulfuric acid is 1: 1.5∶0.075;

[0101] (2) Set the reaction temperature T r 30°C, and control the material in the reactor and the jacket medium to reach the reaction temperature T r ,T r =T j ,T j is the jacket temperature;

[0102] (3) start stirring, stirring rate 100rpm, measure the specific heat and heat transfer coefficient of reaction material under this temperature;

[0103] (4) Grinding pulp (wood pulp), the average diameter of the pulp after grinding is about 0.5 cm. 30 g of pulp was fed into the reactor at a constant speed at a constant rate, and the mass ratio of pulp: acetic anhydride was 0.1875:1. Start the reaction while measuring T r , T j , viscosity and turbidity;

[0104] (5) Using a viscosity m...

Embodiment 2

[0115] (1) Add 260g of acetic anhydride, 320g of acetic acid and 20g of sulfuric acid into the reactor, the volume reaches 2 / 3~3 / 4 of the volume of the reactor, and the mass ratio of acetic anhydride, acetic acid and sulfuric acid is 1: 1.23: 0.076;

[0116] (2) Set the reaction temperature T r 50°C, and control the material in the reactor and the jacket medium to reach the reaction temperature T r ,T r =T j ,T j is the jacket temperature;

[0117] (3) measure the specific heat and heat transfer coefficient of reaction material under this temperature;

[0118] (4) Ground pulp (hardwood pulp), the average diameter of the ground pulp is about 0.5 cm. Place one part of wood pulp under natural conditions in a room temperature room; the other part of wood pulp is dried at 90°C for 30 minutes;

[0119] (5) 50 g of naturally placed wood pulp was fed into the reactor at a constant rate at a constant rate, and the mass ratio of pulp: acetic anhydride was 0.1923:1. Start the reac...

Embodiment 3

[0132] (1) Add 200 g of acetic anhydride, 300 g of acetic acid and 15 g of sulfuric acid into the reactor, the volume reaches 2 / 3 to 3 / 4 of the volume of the reactor, and the mass ratio of acetic anhydride, acetic acid and sulfuric acid is 1: 1.5: 0.075;

[0133] (2) Set the reaction temperature T r 50°C, and control the material in the reactor and the jacket medium to reach the reaction temperature T r ,T r =T j ,T j is the jacket temperature;

[0134] (3) measure the specific heat and heat transfer coefficient of reaction material under this temperature;

[0135] (4) Two parts of ground wood pulp: the grinding parameters are different, and the average diameter of the pulp after grinding is about 1 cm and 0.2 cm respectively;

[0136] (5) Add 40 g of wood pulp with an average diameter of about 1 cm into the reactor at a constant feed rate, and the mass ratio of pulp: acetic anhydride is 0.2:1. Start the reaction while measuring T r , T j , viscosity and turbidity;

...

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Abstract

The invention belongs to the chemical cellulose technical field, and discloses a method and an apparatus for evaluating cellulose pulp reaction performance. The method for evaluating the cellulose pulp reaction performance comprises the following steps: adding a reaction reagent, a solvent and a catalyst in a reaction vessel; setting a reaction temperature Tr, controlling a material and a jacket medium in the reaction vessel to reach the reaction temperature Tr, wherein Tr equals Tj, the Tj is the jacket temperature; measuring the specific heat and heat transfer coefficient of the reaction material under the temperature, adding the cellulose pulp with uniform speed by an invariant feeding rate to react, simultaneously measuring Tr and Tj; measuring and collecting the viscosity and turbidity data, when the absolute value of Tr and Tj is less than or equal to 0.1 DEG C, completing the reaction, measuring the specific heat and heat transfer coefficient of a mixed system in the reaction vessel, calculating the reaction heat release rate Qr, and calculating to obtain the enthalpy delta Hr. The invention comprehensively use the reaction calorimetry, the turbidity and the viscosity for measuring.

Description

technical field [0001] The invention belongs to the technical field of chemical cellulose, and relates to a method and a device for evaluating the reaction performance of cellulose pulp. Background technique [0002] Cellulose pulp is the main raw material for the manufacture of cellulose esters. In terms of chemical structure, cellulose is a linear polymer compound that is connected by many D-glucopyranose units through 1-4 glycosidic bonds. Cellulose sources include wood fiber raw materials, gramineous fiber raw materials, bast fiber raw materials and cotton fiber raw materials. At present, the cellulose source capable of producing cellulose acetate on a commercial scale is mainly wood fiber raw materials, which are divided into hardwood pulp and softwood pulp according to woodiness. [0003] The chemical components in different fiber raw materials, including the content and composition of cellulose, hemicellulose and lignin, have obvious differences. The production of ...

Claims

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Application Information

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IPC IPC(8): G01N25/20G01N11/00
Inventor 梁银春彭为骏曹建华张杰马晓龙陈昀
Owner NANTONG CELLULOSE FIBERS CO LTD
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