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Method for removing byproduct propyl propionate during preparation process of n-propanol by hydrogenation of propionaldehyde

A technology of propyl propionate and n-propanol, which is applied in the field of removing by-product propyl propionate in the process of preparing n-propanol by hydrogenation of propionaldehyde, can solve the problems of no large-scale n-propanol production device and the like, and can achieve energy efficiency. Low consumption, simple process, and the effect of improving purity

Active Publication Date: 2008-07-23
淄博诺奥化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

In this new technology for producing high molecular weight chemicals called NPB (n-Propanyl-2-(methoxymercapto)butyrate), there has been an improvement over previous methods that resulted from adding small amounts of certain substances like calcium or magnesium during reaction steps. By doing these modifications, we can make our final product smarter without compromising its desired properties.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the efficiency or yielding capacity of producing pure chemicals like n-propenyl methacrylate (NPM) at home on an industrial scale without requiring expensive equipment such as solvent extraction systems.

Method used

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  • Method for removing byproduct propyl propionate during preparation process of n-propanol by hydrogenation of propionaldehyde
  • Method for removing byproduct propyl propionate during preparation process of n-propanol by hydrogenation of propionaldehyde

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Effect test

Embodiment 1

[0021] The content of propyl propionate in the crude propanol is 0.3%, and the amount of supplemented water is such that the water content in the crude propanol is 10%. The temperature at the bottom of the light removal tower is controlled at 90°C, and the temperature at the top of the tower is controlled at 75°C. The content of propyl propionate in the final product n-propanol is 0.07%, and the purity of n-propanol is 99.9%.

Embodiment 2

[0023] The content of propyl propionate in the crude propanol is 1%, and the amount of replenishing water makes the water content in the crude propanol 15%. The temperature at the bottom of the light removal tower is controlled at 94°C, and the temperature at the top of the tower is controlled at 80°C. The content of propyl propionate in the final product n-propanol is 0.1%, and the purity of n-propanol is 99.86%.

Embodiment 3

[0025] The content of propyl propionate in the crude propanol is 1.5%, and the amount of supplemented water is such that the water content in the crude propanol is 20%. The temperature at the bottom of the light removal tower is controlled at 96°C, and the temperature at the top of the tower is controlled at 83°C. The content of propyl propionate in the final product n-propanol is 0.11%, and the purity of n-propanol is 99.83%.

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Abstract

The invention provides a removal method for the by-product of propyl propionate generated in the technique of preparing n-propanol with the hydrogenated propionaldehyde, which is characterized in that water is properly supplied to enable the n-propanol, the propyl propionate and the supplied water to reach the three-phase azeotropy when the crude propanol generated from the hydrogenated propionaldehyde is entering a distillation system; and the propyl propionate is removed in a light fraction removal column. The removal method for the by-product of propyl propionate generated in the technique of preparing n-propanol with the hydrogenated propionaldehyde has the advantages that the content of the by-product of propyl propionate generated in the process of preparing n-propanol with the hydrogenated propionaldehyde is effectively reduced; purity of the n-propanol product is greatly improved; the content of n-propanol is improved from original 95% to current more than 99.7%; technological method is simple; and energy consumption is low.

Description

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Claims

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Application Information

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Owner 淄博诺奥化工有限公司
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