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Method for producing calcium sulfate whiskers from waste sulfuric acid

A technology of calcium sulfate whiskers and waste sulfuric acid, which is applied in chemical instruments and methods, single crystal growth, crystal growth, etc., can solve the problems of sulfuric acid by-product environmental pollution, waste sulfuric acid pollution, high treatment cost, etc., and achieve the solution of waste sulfuric acid Effects of pollution problems, simple process operation, good industrial application value and prospects

Inactive Publication Date: 2014-01-29
BENGBU BBCA MEDICINE SCI DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a sulfuric acid method to prepare waste acid in L-ascorbyl palmitate, which is environmentally friendly and effectively solves the problems of environmental pollution caused by sulfuric acid by-products and high processing costs in the prior art. Eliminate the waste sulfuric acid pollution problem, good economic benefits

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1 utilizes waste sulfuric acid in L-ascorbyl palmitate as raw material to produce calcium sulfate whisker

[0036] (1) Collect the waste sulfuric acid in the preparation of L-ascorbyl palmitate by the sulfuric acid method as the raw material, and the sulfuric acid content in the waste sulfuric acid is 19.2%.

[0037] (2) Take 30g of activated carbon, add 600g of waste sulfuric acid with a content of 19.2%, and place the mixture at 50°C for 30 minutes to decolorize, then filter with suction, add 87g of calcium hydroxide to the filtrate, react at room temperature for 20 minutes, and filter with suction. That is, calcium sulfate dihydrate.

[0038] (3) Add the above-mentioned calcium sulfate dihydrate and 2kg of purified water into the reaction kettle, set the stirring speed to 220r / min, the heating temperature to 125°C and pressurize to 2MPa with nitrogen. Under the above conditions, react for 4h.

[0039] (4) Stop heating when the reaction is finished. When ...

Embodiment 2

[0040] Embodiment 2 utilizes waste sulfuric acid in L-ascorbyl palmitate as raw material production calcium sulfate whisker

[0041] (1) Collect waste sulfuric acid in the preparation of L-ascorbyl palmitate by sulfuric acid method as raw material, and the sulfuric acid content in the waste sulfuric acid is 18.6%.

[0042] (2) Take 30g of activated carbon, add 600g of waste sulfuric acid with a content of 18.6%, and place the mixture at 50°C for 30 minutes to decolorize, then filter with suction, add 84g of calcium hydroxide to the filtrate, react at room temperature for 20 minutes, and filter with suction. That is, calcium sulfate dihydrate.

[0043] (3) Add the above-mentioned calcium sulfate dihydrate and 1.8kg of purified water into the reaction kettle, set the stirring speed at 230r / min, the heating temperature at 130°C and pressurize to 2MPa with nitrogen. Under the above conditions, react for 5h.

[0044](4) Stop heating when the reaction is finished. When the tempera...

Embodiment 3

[0045] Embodiment 3 utilizes waste sulfuric acid in L-ascorbyl palmitate as raw material production calcium sulfate whisker

[0046] (1) Collect the waste sulfuric acid in the preparation of L-ascorbyl palmitate by the sulfuric acid method as raw material, and the sulfuric acid content in the waste sulfuric acid is 15%.

[0047] (2) Take 20g of activated carbon, add 200g of waste sulfuric acid with a content of 15%, and decolorize the mixture at 60°C for 10 minutes, then filter with suction, add 70g of calcium hydroxide to the filtrate, react at room temperature for 30 minutes, and filter with suction. That is, calcium sulfate dihydrate.

[0048] (3) Add the above-mentioned calcium sulfate dihydrate and 1.5kg of purified water into the reaction kettle, set the stirring speed to 180r / min, the heating temperature to 100°C and pressurize to 3MPa with nitrogen. Under the above conditions, react for 3h.

[0049] (4) Stop heating when the reaction is finished. When the temperature...

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Abstract

The invention relates to a method for producing calcium sulfate whiskers from waste sulfuric acid in L-ascorbyl palmitate. The method comprises the following steps of: subjecting waste sulfuric acid to activated carbon decolorization processing and then reacting decolorized waste sulfuric acid with calcium hydroxide to generate calcium sulfate dihydrate; then preparing calcium sulfate dihydrate into a suspension and adding the suspension to a pressurized reaction kettle to prepare calcium sulfate hemihydrate whiskers. The method provided by the invention is green, environment-friendly and pollution-free; as waste sulfuric acid is used as the raw material, the pollution problem caused by waste sulfuric acid is effectively solved and the production cost is greatly reduced; besides, the process operation of the method is simple; therefore, the method is suitable for industrial production.

Description

technical field [0001] The invention relates to waste acid treatment, in particular to a method for producing calcium sulfate whiskers by using the sulfuric acid method to prepare waste acid in L-ascorbyl palmitate. Background technique [0002] At present, the production process of L-ascorbyl palmitate mostly uses L-ascorbic acid and palmitic acid as raw materials, and uses concentrated sulfuric acid as a catalyst to prepare it, such as Chinese patents CN101759671, CN102260231 and CN102558115. During this process, a large amount of waste sulfuric acid is generated, causing serious pollution. As the Chinese government and people pay more and more attention to the environment, this old-fashioned production process is facing great pressure for transformation and upgrading due to the accompanying environmental pollution. However, equipment transformation 1. Process upgrading requires a high initial investment. For national enterprises, it is difficult to bear this initial capit...

Claims

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Application Information

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IPC IPC(8): C30B7/10C30B29/62C30B29/46
Inventor 陶涛汪洪湖张亚孙建华林文龙
Owner BENGBU BBCA MEDICINE SCI DEV
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