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Technology for preparing 2-chromium picolinate through one-step method

A technology of chromium picolinate and preparation process, applied in the field of one-step preparation of chromium 2-picolinate, can solve problems such as increased production cost, environmental pollution, multiple by-products, etc., and achieves the effects of reduced damage, low price and simple operation

Inactive Publication Date: 2013-09-25
CHINA ANIMAL HUSBANDRY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Potassium permanganate is used in these two methods, and its price is more expensive. In addition, the oxidation reaction generates a large amount of by-products, which pollutes the environment.
In the method disclosed in CN1408708A, the preparation and purification process of the intermediate product 2-pyridinecarboxylic acid is complicated to operate, and the overall yield of the reaction is reduced, so that the production cost is greatly increased
In CA1772737A, cheaper oxidants such as sulfuric acid, chromic anhydride, and sodium dichromate are used to oxidize 2-picoline. This method reduces the cost of raw materials to a certain extent, but produces more by-products

Method used

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  • Technology for preparing 2-chromium picolinate through one-step method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 1

[0015] Example 1 One-step preparation of chromium 2-picolinate

[0016] Under stirring conditions, add 40 kg of 30% by mass hydrochloric acid, 32.1 kg of 2-cyanopyridine and 26.6 kg of chromium trichloride hexahydrate into the reaction kettle. The temperature is raised to 70°C and reacted for 1.5 hours. After the reaction, the temperature is lowered. To room temperature, centrifuge the material to obtain a rose-red chromium 2-picolinate solid, dried at 80°C for 2 hours, weighed 41.2 kg, and the yield was 98.6%.

Embodiment 2 1

[0017] Example 2 One-step preparation of chromium 2-picolinate

[0018] Under stirring conditions, add 21.5kg of 98% sulfuric acid, 42.9kg of 2-cyanopyridine and 26.1kg of chromium sulfate to the reaction kettle in sequence. The temperature is raised to 50°C for 1.5 hours, and the temperature is lowered to room temperature. After the reaction, The material was centrifuged to obtain a rose-red chromium 2-picolinate solid, which was dried at 80° C. for 2 hours, weighed 55.2 kg, and the yield was 99.1%.

Embodiment 3 1

[0019] Example 3 One-step preparation of chromium 2-picolinate

[0020] Under stirring conditions, add 40 kg of 30% by mass hydrochloric acid, 32.7 kg of 2-cyanopyridine and 26.6 kg of chromium trichloride hexahydrate into the reaction kettle. The temperature is raised to 75°C and reacted for 1.5 hours. After the reaction, the temperature is lowered. After reaching room temperature, the material was centrifuged to obtain a rose-red chromium 2-picolinate solid, which was dried at 80°C for 2 hours, weighed 41.5 kg, and the yield was 99.2%.

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Abstract

The invention relates to a technology for preparing 2-chromium picolinate through a one-step method. The technology comprises the following steps: placing 2-cyanpyridine, an inorganic acid and a water-soluble trivalent chromium salt in a reaction vessel in proportion, carrying out a heating reaction under stirring, filtering after reaction ending to obtain a 2-chromium picolinate solid, and drying to obtain 2-chromium picolinate. The technology which shortens the multi-step reactions of original production technologies to one step has the characteristics of cheap and easily available raw materials, no need of the addition of other substances in the reaction intermediate process, simple operation, low energy consumption and the like. Additionally, there is no need to open the reaction kettle in the reaction process, so the damages to an operator are reduced.

Description

Technical field [0001] The invention relates to the field of chemical synthesis and feed additives, in particular to a process for preparing chromium 2-picolinate by a one-step method. Background technique [0002] As a feed additive, chromium 2-picolinate can increase the output rate of livestock and poultry meat, eggs, milk, and litters, promote the rapid growth of livestock and poultry by reducing blood sugar and fat, improving feed return rate, regulating endocrine, and enhancing livestock and poultry reproductive performance , Improve the carcass quality of livestock and poultry, increase lean meat rate, reduce livestock and poultry stress, and enhance the ability of livestock and poultry to resist heat stress and disease stress. [0003] In the prior art, most of the production methods of chromium 2-picolinate are based on pyridine derivatives, which are oxidized or hydrolyzed to obtain picolinic acid, which is further reacted with chromium trichloride, and then processed to ...

Claims

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Application Information

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IPC IPC(8): C07D213/803
Inventor 吴强三晨光王帅谭薇张宇婷姚真
Owner CHINA ANIMAL HUSBANDRY IND
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