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Method for treating asphalt like slag in preparing rheinic acid and diacerein process with aloe

A diacerein and treatment method technology, applied in the separation/purification of carboxylic acid esters, separation/purification of carboxylic acid compounds, organic chemistry, etc.

Inactive Publication Date: 2009-01-14
江阴南极星生物制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Adopting the present invention can completely dissolve the asphalt-like residue at the bottom of the reaction kettle, and fundamentally solve various defects caused by manual digging

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0007] In the production of rhein and diacerein by the aloe method, the aloe powder needs to be acid-hydrolyzed first, and an asphalt-like residue will be produced during the acidolysis process. When the aloe powder is cooled and discharged, the stirring will not stop. After clearing, close the bottom valve of the reactor, and pump in 0.5-0.8N sodium hydroxide (or sodium bicarbonate) solution. The pumped amount is based on the immersion bitumen-like residue. Heat to 100°C and keep it for 0.5 hours, then open the reaction. The bottom valve of the kettle is released while it is hot, and after it is cleaned, a small amount of water is drawn in to rinse the reaction kettle.

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PUM

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Abstract

The present invention relates to the method of treating asphalt-like slag from the process of preparing rheinic acid and diacerein with aloe, and belongs to the field of medicine producing technology. The method of asphalt-like slag produced in the aloe powder acidifying process includes continuous stirring during discharging material after acidification, closing the valve in the bottom of the caldron after discharging material, pumping in 0.5-0.8 N sodium hydroxide or sodium bicarbonate solution to immerse asphalt-like slag, heating to 100+ / -10deg.c and maintaining for over 0.5 hr, opening the valve to exhaust asphalt-like slag in hot state, and water washing the reaction caldron. The said method can dissolve and exhaust asphalt-like slag completely.

Description

Technical field: [0001] The invention relates to a method for treating asphalt-like residue in the process of preparing rhein and diacerein by aloe method. It belongs to the field of drug production technology. Background technique: [0002] Rhein and diacerein (diacetyl-rhein) are both monomers of anthraquinone derivatives and are considered to be drugs with multi-target functions. The product has a very broad market prospects in European and American countries, and it has also begun to be used in China. [0003] In the production of rhein and diacerein by the aloe method, the aloe powder needs to be acid-hydrolyzed first, and the asphalt-like residue will be produced during the acid-hydrolysis process, which will form a block at the bottom of the reactor during cooling and discharging, which is difficult to take out. Opening the manhole cover of the reaction kettle and manually inserting it into the kettle and taking it out has the defect of inexhaustible removal and potential ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/42C07C66/02C07C67/48C07C69/95
Inventor 黄再新叶峰
Owner 江阴南极星生物制品有限公司