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N-propanol refining technology

A technology of n-propanol, which is applied in the field of clean and energy-saving refining technology, can solve the problems of reducing the yield of n-propanol, environmental pollution, and separation difficulties, and achieves the advantages of saving reprocessing costs, improving product quality, and simple operation Effect

Active Publication Date: 2013-01-23
JIANGSU NINE HEAVEN HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the dehydration of the azeotropic system, the traditional process adopts azeotropic distillation technology, which has the problems of high energy consumption, complicated operation and serious environmental pollution, especially for the ternary azeotropic system of n-propanol-water-propyl propionate (including n-propanol-water-propyl propionate) propanol 40~70wt.%), the follow-up separation is particularly difficult, and is usually treated as waste, which not only reduces the yield of n-propanol but also causes serious environmental pollution

Method used

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  • N-propanol refining technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Such as figure 1 Shown, a kind of n-propanol refining process comprises the following steps: will be stored in crude propanol raw material storage tank 1 and come from the n-propanol crude liquid A of reaction process, in reactor 2, adjust by adding sodium hydroxide NaOH, Make it pH=8, and then pump it into the distillation tower 4 through the feed pump 6 for heating and distillation. The temperature of the bottom of the distillation tower is controlled at 90-115°C, and the temperature at the top of the tower is controlled at 90-105°C. The n-propanol vapor containing 15% water obtained from the top of the distillation tower enters the pervaporation membrane separation unit 5 for alcohol-water separation. The separation unit 5 is a membrane separator composed of 10 sets of NaA molecular sieve membranes, and the measured pressure of the feed liquid is 0.25MPa , the pressure on the permeate side is controlled at 2000Pa, the temperature of the feed liquid in the pervaporati...

Embodiment 2

[0021] Such as figure 1 Shown, a kind of n-propanol refining process comprises the following steps: will be stored in the thick n-propanol thick liquid A of reaction process in crude propanol raw material storage tank 1, by adding sodium hydroxide NaOH adjustment in reactor, make Its pH=9, and then pumped into the distillation tower 4 through the feed material 6 for heating and distillation. The temperature of the bottom of the distillation tower is controlled at 115-125°C, and the temperature at the top of the tower is controlled at 105-115°C. The n-propanol vapor with a water content of 5% from the top of the distillation tower enters the pervaporation membrane separation unit 5 for alcohol-water separation. The separation unit 5 is a membrane separator composed of 5 sets of NaA molecular sieve membranes, and the measured pressure of the feed liquid is 0.2 MPa, the permeate side pressure is controlled at 1700Pa, the feed liquid temperature of the pervaporation membrane separ...

Embodiment 3

[0023] Such as figure 1 Shown, a kind of n-propanol refining process comprises the following steps: will be stored in crude propanol raw material storage tank 1 and come from the n-propanol crude liquid A of reaction process, in reactor 2, adjust pH by adding potassium hydroxide KOH =8, then pumped into the distillation tower 4 for heating and distillation, the temperature of the bottom of the distillation tower is controlled at 125-150°C, and the temperature at the top of the tower is controlled at 115-130°C. The n-propanol vapor with a water content of 8% from the top of the distillation tower enters the pervaporation membrane separation unit 5 for alcohol-water separation. The separation unit 5 is a membrane separator composed of 15 sets of NaA molecular sieve membranes, and the measured pressure of the feed liquid is 0.1 MPa, the permeate side pressure is controlled at 3000Pa, the feed liquid temperature of the pervaporation membrane separator is controlled at 125-150°C, t...

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Abstract

The invention discloses an n-propanol refining technology which comprises the following steps of: in a reaction kettle, adjusting the pH value of the n-propanol coarse liquid to 8-10 by adding alkaline liquid into the coarse propanol from an n-propanol reaction process; injecting the adjusted coarse propanol liquid from the reaction kettle into a distillation tower by a pump; controlling the temperature of the tower kettle of the distillation tower to 95-130 DEG C, and controlling the temperature at the tower top to 90-130 DEG C; enabling the steam containing water and propanol obtained from the top of the distillation tower to enter a pervaporation membrane separation unit for dehydration; and further cooling the n-propanol steam obtained from the membrane separation unit by circulating water to obtain the product, and collecting the product.

Description

technical field [0001] The invention relates to a clean and energy-saving refining process for producing n-propanol. Background technique [0002] N-propanol is an important chemical raw material and organic solvent. my country has a great demand for n-propanol, especially in the fields of pesticides, coatings and pharmaceutical industries. However, the domestic production of n-propanol cannot meet the needs of the domestic market. In addition, the production and development process of domestic n-propanol is relatively backward, and the purity of domestically produced n-propanol often fails to meet the quality requirements required by the market, mainly reflected in the control of propyl propionate and water content. [0003] The production process of n-propanol mainly consists of two processes: reaction and refining. During the hydrogenation reaction of propionaldehyde to produce propanol, a small amount of propionaldehyde is oxidized to propionic acid, and propionic acid ...

Claims

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Application Information

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IPC IPC(8): C07C31/10C07C29/74
Inventor 顾学红陈纲领余从立邢卫红庆祖森
Owner JIANGSU NINE HEAVEN HIGH TECH
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