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Production process for caffeine

A production process and caffeine technology, applied in the field of chemistry, can solve the problems of cumbersome production process of caffeine and inability to guarantee the quality of caffeine finished products, and achieve the effects of fast filtration, improved efficiency and pure filtrate.

Inactive Publication Date: 2016-11-09
安徽柒柒塑业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production process of caffeine is relatively cumbersome, and the quality of caffeine finished products cannot be guaranteed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A production process of caffeine is characterized in that its steps comprise:

[0033] (1) Synthesis process of dimethylurea

[0034] Pump 200g of urea into the synthesis tank, raise the temperature to 120°C with steam and a heater, melt the urea in the tank, add 150g of monomethylamine into the synthesis tank, the reaction time is 30min, transfer the dimethylurea produced by the reaction into Dimethyl urea storage tank;

[0035] (2) Neutralization process

[0036] Add 150g of sodium carbonate and 21.6L of primary water into the dissolving tank, put 300g of chloroacetic acid into the neutralization tank, add the sodium carbonate solution into the chloroacetic acid solution under stirring at a speed of 100r / min, and adjust the pH value to 6.5 After the neutralization is completed, the sodium chloroacetate solution is pumped into the high-level tank for subsequent use;

[0037] (3) Cyanide process

[0038] Add 50g of liquid sodium cyanide into the cyanide tank, quickl...

Embodiment 2

[0054] A production process of caffeine is characterized in that its steps comprise:

[0055] (1) Synthesis process of dimethylurea

[0056] Pump 250g of urea into the synthesis tank, heat up to 145°C with steam and a heater to melt the urea in the tank, add 175g of monomethylamine to the synthesis tank, and the reaction time is 45min. Methanol storage tank;

[0057] (2) Neutralization process

[0058] Add 150g of sodium carbonate and 21.6L of primary water into the dissolving tank, put 350g of chloroacetic acid into the neutralization tank, add the sodium carbonate solution into the chloroacetic acid solution under stirring at a speed of 167r / min, and adjust the pH value to 7.0 After the neutralization is completed, the sodium chloroacetate solution is pumped into the high-level tank for subsequent use;

[0059] (3) Cyanide process

[0060] Add 55g of liquid sodium cyanide into the cyanide tank, quickly press the sodium cyanoacetate in the metering tank into the cyanide t...

Embodiment 3

[0076] A production process of caffeine is characterized in that its steps comprise:

[0077] (1) Synthesis process of dimethylurea

[0078] Pump 280g of urea into the synthesis tank, raise the temperature to 150°C with steam and a heater, melt the urea in the tank, add 180g of monomethylamine into the synthesis tank, the reaction time is 45min, transfer the dimethylurea produced by the reaction into Dimethyl urea storage tank;

[0079] (2) Neutralization process

[0080] Add 200g of sodium carbonate and 21.6L of primary water into the dissolving tank, put 500g of chloroacetic acid into the neutralization tank, add the sodium carbonate solution into the chloroacetic acid solution under stirring at a speed of 200r / min, and adjust the pH value to 7.5 After the neutralization is completed, the sodium chloroacetate solution is pumped into the high-level tank for subsequent use;

[0081] (3) Cyanide process

[0082] Add 60g of liquid sodium cyanide into the cyanide tank, quickl...

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PUM

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Abstract

The invention discloses a production process for caffeine. A catalyst is separated with formic acid, wherein as a separating agent of the catalyst, formic acid is easy to obtain and insoluble in a mother solution and is an ideal separating agent; theophylline is separated with the method of pressure filtration, wherein the pressure is 227 KPa, and compared with a common filtration mode, in pressure filtration, the filtering speed is high, and filter liquor is pure; the drying mode of crystals is changed into spin-drying with a centrifugal machine with the rotating speed of 5000 r / min, and compared with an air-drying mode, the rate of the water loss of centrifugal spin-drying is high, and thus the production efficiency can be greatly improved; secondary waste carbon is used for decoloring of a coarse caffeine solution, and compared with active carbon, the secondary carbon can reach the same decoloring effect while the process is more environmentally friendly and small in investment; secondary refining is additionally carried out, caffeine obtained after primary crystallization is subjected to secondary crystallization, and thus caffeine can be greatly purified.

Description

technical field [0001] The invention relates to the field of chemistry, in particular to a caffeine production process. Background technique [0002] Caffeine is a xanthine alkaloid compound, a central nervous system stimulant that can temporarily drive away drowsiness and restore energy. Coffee, tea, soft drinks and energy drinks that contain caffeine are very popular, so caffeine is the most commonly used psychotropic drug in the world. At present, the production process of caffeine is relatively complicated, and the quality of caffeine finished products cannot be guaranteed. Therefore the technology that can produce the caffeine of high purity will be welcomed by the market. Contents of the invention [0003] A production process of caffeine is characterized in that its steps comprise: [0004] (1) Synthesis process of dimethylurea [0005] Pump 200-280g of urea into the synthesis tank, heat up to 120-150°C with steam and a heater to melt the urea in the tank, add 1...

Claims

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Application Information

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IPC IPC(8): C07D473/12
CPCC07D473/12
Inventor 姚海军
Owner 安徽柒柒塑业有限公司
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