Technique for directly recycling water and other resources in production process of caffeine

A technology of production process and process technology, applied in the direction of water/sewage treatment, water/sludge/sewage treatment, alkali metal hydroxide, etc., can solve the problems of difficult treatment and high cost, achieve small investment, realize economic benefits, The effect of increasing yield

Inactive Publication Date: 2010-07-07
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. Purpose of the invention: The present invention provides a new water resource recycling technology in the caffeine synthesis process, the purpose of which is to solve the problems of difficult treatment and high cost in the traditional terminal wastewater treatment method, and realize the recycling of resources

Method used

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  • Technique for directly recycling water and other resources in production process of caffeine
  • Technique for directly recycling water and other resources in production process of caffeine
  • Technique for directly recycling water and other resources in production process of caffeine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take 200ml of the original mother liquor for washing with water, add 7.0204g of quicklime, stir for 1 hour and then filter with suction to obtain the required circulating liquid, wash and dry the precipitate.

[0020] In a water bath less than 70°C, take 50ml of dimethylcyanoacetylurea (PH=2.0~2.5), add 170ml of the above-mentioned filtrate during stirring, and then add PH=8~9, and add 3ml of 10% NaOH, then PH=9.3~9.7 , raise the temperature to 88-90°C, keep warm at this temperature for 30 minutes, retest the pH value every 10 minutes during the heat preservation process, keep the pH value between 9.3-9.7, and cool the material to 48-52°C after the reaction , to realize the cyclization reaction in the caffeine synthesis process.

[0021] At room temperature, take 3.5035g of sodium nitrite and dissolve it in the above cooling solution, slowly add 18ml of 31% H 2 SO 4 After putting it in the three-necked bottle, PH=3.0~3.5, then drop the starch potassium iodide test sol...

Embodiment 2

[0023] After repeating the reaction of Example 1 for 5 times, take 200ml of the obtained circulating liquid for six times, add 7.0208g of quicklime, stir for 1 hour and then filter with suction to obtain the required circulating liquid, wash and dry the precipitate.

[0024] In a water bath less than 70°C, take 50ml of dimethylcyanoacetylurea (PH=2.0~2.5), add 170ml of the above-mentioned filtrate during stirring, and then add PH=7~8, add 7.5ml of 10% NaOH, and then add PH=9.3~ 9.7, raise the temperature to 88-90°C, keep warm at this temperature for 30 minutes, retest the pH value every 10 minutes during the heat preservation process, keep the pH value between 9.3-9.7, and cool the material to 48-52 after the reaction ℃, to realize the cyclization reaction in the caffeine synthesis process.

[0025] At room temperature, take 3.5096g of sodium nitrite and dissolve in the above cooling solution, slowly add 18ml of 31% H 2 SO 4 After putting it in the three-necked bottle, PH=3....

Embodiment 3

[0027] Take 200ml of water to wash the original mother, add 3.5142 quicklime, stir for 1 hour and filter with suction to obtain the required circulating liquid, wash and dry the precipitate.

[0028] In a water bath less than 70°C, take 50ml of dimethylcyanoacetylurea (PH=2.0~2.5), add 170ml of the above-mentioned filtrate during stirring, and then add PH=6~7, and add 10ml of 10% NaOH, then PH=9.3~9.7 , raise the temperature to 88-90°C, keep it warm at this temperature for 30 minutes, retest the pH value every 10 minutes during the heat preservation process, keep the pH value between 9.3-9.7, and cool the material to 48-52°C after the reaction , to realize the cyclization reaction in the caffeine synthesis process.

[0029] At room temperature, take 3.5044g of sodium nitrite and dissolve it in the above cooling solution, slowly add 18ml of 31% H 2 SO 4 After putting it in the three-necked bottle, PH=3.0~3.5, then drop the starch potassium iodide test solution on the color co...

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Abstract

The invention relates to a technique for directly recycling water and other resources in the production process of caffeine. SO42- in high-concentration inorganic salt waste water in easy process is treated, the treated water is recycled in processes corresponding to the production of caffeine, consequently, the utilization rate of production materials is increased, and water and other resources are recycled. The production process and production equipment are simple, the investment is less, operation is safe and reliable, chemical resources are sufficiently and effectively utilized, the treatment process cannot generate secondary pollution, 'zero emission' during the production process is almost realized, consequently, consumption and emission are facilitated to be reduced, the operation cost is low, moreover, certain economic benefit can be achieved, and the social benefit is high.

Description

1. Technical field [0001] The invention relates to the recycling technology of water and other resources in the caffeine production process, and belongs to the technical field of effective utilization of water and chemical resources. 2. Background technology [0002] Caffeine (1,3,7-trimethylxanthine) is a central nervous system stimulant drug, commonly used in antipyretic and analgesic drugs. Caffeine is used as a stimulant, bittering agent, and spice, mainly for cola-type drinks and coffee-containing drinks. Chemical synthesis is the main source of caffeine production, but the chemical synthesis process consumes a lot of water resources and produces a large amount of high-salt wastewater with a salt content of more than 220g / L. The wastewater at each stage has a high COD value, up to to 70,000-80,000 mg / L, and as low as 15,000-20,000 mg / L. Such wastewater with high concentration of inorganic salts and organic pollutants is difficult to treat. At present, there are few r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C01F11/46C01D1/04
Inventor 李保山李利芳
Owner BEIJING UNIV OF CHEM TECH
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