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Method for producing 2,5-dimethyl-2,5-hexanediol by employing alkynylation condensation process

A technology of dimethyl and hexanediol, which is applied in the direction of chemical instruments and methods, preparation of organic compounds, alkali metal compounds, etc., can solve problems that affect the economic benefits and sustainable development of enterprises, and achieve the effect of saving costs

Active Publication Date: 2014-07-09
泸州宏达有机化工厂
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Problems solved by technology

However, in the domestic counterparts, the research and development of the recovery and recycling technology of potassium hydroxide has not yet been carried out, which has seriously affected the economic benefits and sustainable development of enterprises.

Method used

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  • Method for producing 2,5-dimethyl-2,5-hexanediol by employing alkynylation condensation process
  • Method for producing 2,5-dimethyl-2,5-hexanediol by employing alkynylation condensation process

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with accompanying drawing.

[0021] Such as figure 1 The shown alkynylation condensation method produces 2,5-dimethyl-2, the method for 5-hexanediol, and this method comprises the following steps: 1. reaction generates intermediate product hexynediol step; Drop into benzene in reactor 13 , Potassium hydroxide, stir, then pass nitrogen for 60 minutes, add acetylene, control the pressure of the reactor at 0.08MPa, slowly and evenly add acetone when the temperature of the reactor rises to 45°C, control the reaction temperature at 43-47°C, stop adding acetone After holding the pressure for 2 hours, then add water to wash;

[0022] 2. After washing, put the material into the potassium hydroxide separation kettle 1 for hydraulic pressure, and let it stand for stratification. After the stratification, the mixed solution of potassium hydroxide containing high concentration is put into the lye storage tank 2 t...

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Abstract

A disclosed method for producing 2,5-dimethyl-2,5-hexanediol by employing alkynylation condensation process comprises the following steps: (1) taking acetylene and acetone as raw materials to prepared a material solution containing hexynediol; (2) performing separation by employing a potassium hydroxide separation kettle; (3) sending the potassium hydroxide aqueous solution into a nickel alloy continuous evaporator for performing distillation condensation on the potassium hydroxide aqueous solution; (4) sending concentrated potassium hydroxide solution to an inorganic impurity separation apparatus to remove organic impurities; (5) sending the potassium hydroxide aqueous solution subjected to impurity removing to a cast iron evaporator, evaporating water away to form solid potassium hydroxide, then continuously heating to enable solid potassium hydroxide to be in a molten state, and then naturally cooling to perform recrystallization; and (7) cutting recrystallized potassium hydroxide into sheets by a slicer for cycle use as a catalyst raw material. Compared with the prior art, potassium hydroxide is subjected cyclic utilization, so that cost is saved.

Description

technical field [0001] The invention relates to the production of 2,5-dimethyl-2,5-hexanediol by the alkynylation condensation method, in particular to a method for producing 2,5-dimethyl-2,5-hexanediol by the alkynylation condensation method. Background technique [0002] There are very few enterprises producing 2,5-dimethyl-2,5-hexanediol in China, and the main large-scale enterprises are distributed in Luzhou City, Sichuan Province, including Luzhou Xinfu Chemical Co., Ltd. (the wholly-owned holding company of the enterprise) ), with an annual output of 5,000 tons; Luzhou Fubang Chemical Company, with an annual output of 2,000 tons; Luzhou Ruixing Chemical Company, with an annual output of 1,200 tons. There are a few other companies such as Sichuan Yibin Hengde Chemical Co., Ltd. that produce this product, but on a smaller scale. [0003] Domestic enterprises mainly use benzene as a solvent and potassium hydroxide as a catalyst to obtain DHAG (2,5-dimethyl-2,5 -hexynedi...

Claims

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Application Information

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IPC IPC(8): C07C31/20C07C29/42C01D1/28C01D1/44
CPCC01D1/28C01D1/44C07C29/42C07C31/20Y02P20/584
Inventor 聂勇
Owner 泸州宏达有机化工厂
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