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New method for preparing 1,2-pentadiol

A technology of pentanediol and pentanol, which is applied in the fields of hydrolysis preparation and organic chemistry, can solve the problems of heavy environmental pollution, difficult use, complex process, etc., and achieve the effect of reducing raw material cost, simple process, and wide source of raw materials

Active Publication Date: 2010-11-17
JIANGSU YANGNONG CHEM GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above routes may have complicated processes, serious environmental pollution, or special raw materials that are not easy to obtain, high cost, and some raw materials are highly toxic, difficult to use and other practical problems that are difficult to solve.

Method used

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  • New method for preparing 1,2-pentadiol
  • New method for preparing 1,2-pentadiol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 intermediate 1, the preparation of 2-epoxypentane

[0029] Add 555.7 g of chloropentanol (wherein the content of 2-chloro-1-pentanol is 99.0%, and 1-chloro-2-pentanol is 0.2%) in a four-necked glass flask equipped with a stirrer, a condenser, and a thermometer 10% sodium hydroxide aqueous solution 2250g, start stirring, heat up to 70°C, heat preservation reaction for 60min; drop to room temperature, neutralize the pH to 7 with hydrochloric acid, let stand, and separate layers to obtain 382.7g of the upper yellow oily substance which is 1, 2-Epoxypentane, its purity is 98.6%, and the yield of p-chloropentanol is 97.5%.

Embodiment 2

[0030] Embodiment 2 intermediate 1, the preparation of 2-epoxypentane

[0031] Add 562.5 g of chloropentanol (wherein the content of 2-chloro-1-pentanol is 68.6%, 1-chloro-2-pentanol 29.4%) in the four-necked glass flask equipped with stirrer, condenser and thermometer , 2250g of 10% aqueous sodium hydroxide solution, started stirring, raised the temperature to 70°C, and kept the temperature for 60 minutes; lowered to room temperature, neutralized the pH to 7 with hydrochloric acid, allowed to stand, and separated into layers to obtain 383.4g of the upper yellow oily substance which was 1, 2-Epoxypentane, its purity is 96.8%, the yield of p-chloropentanol is 95.9%.

Embodiment 3

[0032] Embodiment 3 intermediate 1, the preparation of 2-epoxypentane

[0033] Add 554.0 g of chloropentanol (wherein the content of 2-chloro-1-pentanol is 0.3%, 1-chloro-2-pentanol 99.2%) in the four-necked glass flask equipped with stirrer, condenser and thermometer 10% sodium hydroxide aqueous solution 2250g, start stirring, heat up to 70°C, keep warm for 60min; cool down to room temperature, neutralize the pH to 7 with hydrochloric acid, let stand, separate layers, and obtain 385.0g of the upper yellow oily substance which is 1, 2-Epoxypentane, its purity is 97.2%, the yield of p-chloropentyl alcohol is 96.7%.

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PUM

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Abstract

The invention provides a new method for preparing 1,2-pentadiol by using chloropentanol as a main raw material, which comprises the following steps: adding the chloropentanol and aqueous solution of an alkali into a reactor at room temperature; stirring the mixture, heating the mixture to 60 to 80 DEG C and keeping the temperature for reaction in a period till the reaction is completed; neutralizing the reactants with acid and / or distilling the reactants under normal pressure, and performing demixing to obtain 1,2-pentadiol; adding an organic solvent, a hydration catalyst and water, stirring the mixture, heating the temperature to 30 to 100 DEG C, keeping the temperature for reaction in a period till the reaction is completed, neutralizing a water layer with an alkali if the water layer is acidic, dehydrating under a reduced pressure to obtain a coarse product of the 1,2-pentadiol, and distilling to obtain high-purity 1,2-pentadiol. The invention has the advantages that: the process flow is simple; the reaction conditions are mild; the yield is high; and the purity of the prepared 1,2-pentadiol is higher than 99.9 percent.

Description

technical field [0001] The present invention relates to a kind of preparation method of chemical product 1,2-o-diol, more particularly, relate to a kind of new method of preparation 1,2-pentanediol. Background technique [0002] 1,2-O-diol is an important chemical raw material, which is often used to produce polyester and surfactant, and can also be used as a raw material for pharmaceuticals. Straight-chain 1,2-o-diols especially C 2 ~C 4 Most of the vicinal diols are prepared by hydration of epoxides under high temperature and pressure or alkaline or acidic conditions, and can also be prepared by oxidative hydration of terminal alkenes. [0003] 1,2-pentanediol (C 5 The 1,2-o-diol) is an important organic intermediate, which is mainly used for the synthesis of the fungicide propiconazole, and is also an important raw material for the production of polyester fibers, surfactants, cosmetics, medicines and other products. U.S. Patent US4605795A (1986-08-12) discloses a cont...

Claims

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Application Information

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IPC IPC(8): C07C31/20C07C29/10
Inventor 丁克鸿程晓曦郑亚清许金来吴惠王根林杨进陆春明金野
Owner JIANGSU YANGNONG CHEM GROUP
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