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New method for preparing tripropylene glycol

A technology for tripropylene glycol and dipropylene glycol, which is applied in the field of preparing tripropylene glycol, can solve the problems of low yield of tripropylene glycol, increase in manufacturing cost, etc., and achieves reduction in the generation of by-products, low energy consumption, and low cost. high rate effect

Inactive Publication Date: 2012-11-14
TONGLING JINTAI CHEM INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of tripropylene glycol in Chinese patents CN1803743, CN101250093 and CN101941893A all use 1,2-propylene glycol as raw material, but the catalysts selected are different. Using these methods to prepare tripropylene glycol, the yield of the produced product tripropylene glycol Low, which in turn increases the manufacturing cost of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The raw material dipropylene glycol is pumped into the static tubular reactor to the visible liquid level, and when the temperature is raised to 140°C, the system starts to feed continuously, wherein the feed amounts of the raw materials are: dipropylene glycol ( DPG) feed rate is 5.36L / h, propylene oxide (PO) feed rate is 1.32L / h, catalyst sodium ethoxide feed rate is 2.47mL / h. The reaction temperature is controlled at 120-140°C, the reaction pressure is not particularly limited, and the output is controlled at about 6.8L / h. Detection content: 43.2% of dipropylene glycol, 54.1% of tripropylene glycol, and 2.0% of tetrapropylene glycol.

Embodiment 2

[0017] The raw material dipropylene glycol is pumped into the static tubular reactor to the visible liquid level, and when the temperature is raised to 125°C, the system starts to feed continuously, wherein the feed amounts of the raw materials are: dipropylene glycol ( DPG) feed rate is 0.48m3 / h, propylene oxide (PO) feed rate is 0.17m3 / h, catalyst sodium methoxide feed rate is 2.00L / h. The reaction temperature is controlled at 110-130°C, the reaction pressure is not particularly limited, and the output is controlled at about 0.6 m3 / h. Detection content: dipropylene glycol 36.6%, tripropylene glycol 61.3%, and tetrapropylene glycol 1.7%.

Embodiment 3

[0019] The raw material dipropylene glycol is pumped into the static tubular reactor to the visible liquid level, and when the temperature is raised to 150°C, the system starts to feed continuously, wherein the feed amounts of the raw materials are: dipropylene glycol ( DPG) feed rate is 0.83m3 / h, propylene oxide (PO) feed rate is 0.28m3 / h, catalyst sodium methoxide feed rate is 3.44L / h. The reaction temperature is controlled at 150-160°C, the reaction pressure is not particularly limited, and the output is controlled at about 1.1 m3 / h. Detection content: dipropylene glycol 37.1%, tripropylene glycol 60.4%, and tetrapropylene glycol 2.4%.

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PUM

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Abstract

The invention discloses a new method for preparing tripropylene glycol and aims at providing a new tripropylene glycol preparation method which is simple in process, low in cost, high in product yield and purity and low in chroma. The new method is characterized by enabling dipropylene glycol, epoxy propane and a catalyst which have the mole ratio of 1:(0.1-1.45):(0.003-0.1) to undergo a reaction in a static tubular reactor under the condition of strong basicity, and obtaining a high-purity tripropylene glycol product by acid neutralization and decompressing rectification.

Description

technical field [0001] The invention relates to a new method for preparing tripropylene glycol, which belongs to the field of fine chemical production. Background technique [0002] Tripropylene glycol (TPG), molecular formula is , with a molecular weight of 192.25. It can be used as pharmaceutical raw materials, intermediates for the manufacture of dyes, fiber treatment agents, anti-corrosion additives, etc., can be used as water-soluble paint base materials, synthetic resin solvents, and can also be used as polyurethane elastomers and adhesives for paints. Main raw material for curing monomer tripropylene glycol diacrylate (TPGD). [0003] At present, the preparation method of tripropylene glycol mostly uses 1,2-propanediol and propylene oxide as raw materials, and the obtained product is a mixture of dipropylene glycol and tripropylene glycol, and the content of tripropylene glycol in the obtained product is Low content, deep color. The preparation of tripropylene gl...

Claims

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Application Information

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IPC IPC(8): C07C43/13C07C41/03
Inventor 王桂珍方诒胜于婷查诺明张国友
Owner TONGLING JINTAI CHEM INDAL