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Method for preparing high-purity sulfuric acid solvent used for para-aramid spinning

A technology of para-aramid spinning and sulfuric acid, which is applied in the field of chemical engineering, can solve the problems of high price, increased production cost of para-aramid production enterprises, and inability to be directly used as a solvent for para-aramid spinning, so as to get rid of Dependence, low cost effect

Inactive Publication Date: 2012-12-26
SHANGHAI HUIBO NEW MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The concentration of high-concentration sulfuric acid sold on the market is generally between 95% and 98%, which cannot be directly used as a solvent for para-aramid spinning, and must be further concentrated
Sulfuric acid manufacturers can inject SO into 95%~98% concentrated sulfuric acid 3 Gas, increase the concentration of concentrated sulfuric acid to between 99% and 100%, but at present, the amount of high-purity sulfuric acid used for para-aramid spinning is between 99% and 100%, compared with the conventional sulfuric acid output of sulfuric acid manufacturers. To put it mildly, sulfuric acid manufacturers are unwilling to invest in transforming the original production lines that have been finalized. Even if there are sulfuric acid manufacturers willing to produce high-purity sulfuric acid for para-aramid spinning, the price is much more expensive than conventional products, which means that there will be Increase the production cost of para-aramid fiber production enterprises

Method used

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  • Method for preparing high-purity sulfuric acid solvent used for para-aramid spinning

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Using commercially available 98 acid (the actual concentration is 96.5% after testing) and 20% oleum (calculated as sulfuric acid, the actual test concentration is 104.5%), 98 acid and 20% oleum are passed through the basket filter respectively Filtration, gear pump delivery, and mass flowmeter metering, 98 acid at a flow rate of 9 mass parts / hour and 20% oleum at a flow rate of 7 mass parts / hour, simultaneously enter the static mixer and mix to form a high-purity sulfuric acid. After testing, the actual concentration is 99.8%.

Embodiment 2

[0020] Using commercially available 98 acid (the actual concentration is 96.5% after testing) and 50% oleum (calculated as sulfuric acid, the actual test concentration is 111.3%), 98 acid and 50% oleum are passed through the basket filter respectively Filtration, gear pump delivery, mass flow meter metering, 98 acid at a flow rate of 11.5 parts by mass / hour and 50% oleum at a flow rate of 3.5 parts by mass / hour, simultaneously enter the static mixer and mix to form a high-purity sulfuric acid. After testing, the actual concentration is 99.9%.

Embodiment 3

[0022] Using commercially available 98 acid (the actual concentration is 96.5% after testing) and 65% oleum (calculated as sulfuric acid, the actual test concentration is 114.5%), 98 acid and 65% oleum are passed through the basket filter respectively Filtration, gear pump delivery, mass flow meter metering, 98 acid at a flow rate of 14.5 parts by mass / hour and 65% oleum at a flow rate of 3.5 parts by mass / hour, simultaneously enter the static mixer and mix to form a high-purity sulfuric acid. After testing, the actual concentration is 99.9%.

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Abstract

The invention relates to a method for preparing a high-purity sulfuric acid solvent used for para-aramid spinning, belonging to the field of chemical engineering. The method is characterized in that after concentrated sulfuric acid and fuming sulfuric acid are respectively filtered and metered according to certain mass ratios, the concentrated sulfuric acid and the fuming sulfuric acid are sufficiently mixed in a mixer to form high-purity sulfuric acid. According to the method, two conventional sulfuric acid products are used for preparing the high-purity sulfuric acid solvent, which is convenient for a para-aramid production enterprise to prepare the high-purity sulfuric acid solvent by self, and the dependence on a sulfuric acid production manufacturer is dispensed; and compared with the mode of purchasing the high-purity sulfuric acid solvent from the sulfuric acid production manufacturer, the method has the advantages of lower cost and more flexibility when the para-aramid production enterprise prepares the high-purity sulfuric acid solvent by self.

Description

technical field [0001] It belongs to the field of chemical engineering and relates to the preparation technology of high-purity sulfuric acid. Specifically, it relates to a method for preparing high-purity sulfuric acid solvent for para-aramid spinning. Background technique [0002] Para-aramid fiber is also called poly-p-phenylene terephthalamide fiber. Para-aramid fiber is the most widely used and most demanded organic fiber among the three high-performance fibers in the world today. Para-aramid fiber is used in the material industry Known as "Variable King Kong", it has a wide range of uses and is the first choice for manufacturing high-strength lightweight armor and special protective materials. It is widely used in aerospace, aviation, military industry, electromechanical, construction, automobiles, sporting goods and other fields. [0003] In the spinning process of para-aramid fiber, a large amount of sulfuric acid should be used as the spinning solvent. The concentr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/74D01F6/80
Inventor 罗丹刘岳新罗谷田刘成明王翠平王秋娥
Owner SHANGHAI HUIBO NEW MATERIAL SCI & TECH
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