Method for preparing electronic grade propylene glycol monomethyl ether

A technology of propylene glycol methyl ether and electronic grade, which is applied in the field of preparation of electronic grade propylene glycol methyl ether, can solve the problems that electronic chemicals cannot be used, cannot reach electronic grade, etc., achieves easy separation, reduces the generation of waste liquid, and has high conversion rate Effect

Inactive Publication Date: 2009-12-30
JIANGSU RUIJIA CHEM
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  • Summary
  • Abstract
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Problems solved by technology

[0009] Because sodium alkoxide catalysts are commonly used in the prior art, many metal ion contents in the finished produc

Method used

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  • Method for preparing electronic grade propylene glycol monomethyl ether

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The process flow chart of this embodiment is as figure 1 shown.

[0026] Step 1: System Replacement

[0027] Fill the system of catalytic rectification tower 1 and 2 with pure nitrogen (≥99.95%) to 0.1-0.3MPa, then vent the pressure to 0.01-0.03MPa, turn on the vacuum pump to evacuate the system to 150-250mmHg, repeat nitrogen filling, pumping Vacuum 3 times, and finally keep the system nitrogen pressure at about 0.05MPa.

[0028] Step 2: Establish a full backflow

[0029] Pump into catalytic rectification tower 1, 2 and account for the methanol and triethylamine of system volume 20~30% (the concentration of triethylamine in total reflux system at this moment is 3~5%), open preheater steam, heat When the material boils, a stable total reflux state is established.

[0030] Step 3: Feed reaction

[0031] After the total reflux is established, use a pump to add a mixture of ethylene oxide and methanol with a molar ratio of 1 to 5 to the bottom of tower 1 to start the ...

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Abstract

The invention discloses a method for preparing electronic grade propylene glycol monomethyl ether, which is as follows: propylene oxide and methyl alcohol are taken as raw materials to be converted into propylene glycol monomethyl ether under the condition that triethylamine is used as a catalyst, and the whole reaction process is carried out in a catalytic distillation tower made of stainless steel materials. The metallic ion content of the electronic grade propylene glycol monomethyl ether is greatly reduced from 250-1000PPb to less than 5PPb, and the conversion rate of the propylene oxide is high, i.e. the conversion rate of the propylene oxide is more than 99.5 percent. In addition, the invention can also reduce the generated waste liquor, thereby according with the requirement for environmental protection.

Description

technical field [0001] The present invention relates to the preparation method of fine chemicals, specifically, the present invention is a kind of preparation method of electronic grade propylene glycol methyl ether. Background technique [0002] Propylene glycol methyl ether is a class of fine chemicals with excellent performance. Because it has two strong solvent factors or groups-ether bond and hydroxyl group, it is known as a "universal" solvent. It is used as a solvent or organic raw material. Widely used in industrial fields such as coatings, paints, inks, printing, dyes, leather, photosensitive materials, electronic chemicals, advanced cleaning agents, synthetic brake fluids and jet fuel additives. The toxicity of propylene glycol ether compounds is much lower than that of ethylene glycol ether compounds, so they are gradually replacing the latter. [0003] Electronic grade propylene glycol methyl ether is used as a cleaning solution or stripping solution in the manu...

Claims

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Application Information

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IPC IPC(8): C07C43/10C07C41/03B01J31/02
CPCY02P20/10
Inventor 张勇周子牛杨旭中路涛
Owner JIANGSU RUIJIA CHEM
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