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Process for producing polyester

A production method and technology of polyester, applied in the field of polyester production, can solve problems such as poor solubility and poor color of polyester

Active Publication Date: 2008-12-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is that the glycol compound of titanium existing in the prior art has poor solubility in ethylene glycol, and the problem of poor hue of the polyester prepared with this type of catalyst provides a new Production method of polyester

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of Catalyst A

[0033] Add 12.4 grams (0.2 mol) of ethylene glycol in the reactor that stirrer, condenser and thermometer are equipped with, slowly drop into reactor 28.4 grams (0.1 mol) tetraisopropyl titanate, separate out white precipitate, After reacting at 70°C for 2 hours, the product was centrifuged, and the residue was washed with distilled water three times, and the product was vacuum-dried at 70°C. A white powdery substance was obtained.

[0034] The dried white powdery substance is placed in a reactor with a stirrer, a condenser and a thermometer, and 13.2 grams (0.2 moles) of lithium acetate, 28 grams (0.2 moles) of trimethyl phosphate and 200 grams of ethylene glycol are added , react at a reaction temperature of 150° C. for 3 hours until the system becomes a homogeneous liquid, and catalyst A is obtained.

[0035] Preparation of polyester

[0036] With 500 grams of terephthalic acid and 316 grams of ethylene glycol and catalyst A (based on t...

Embodiment 2

[0039] Add 24.8 grams (0.4 moles) of ethylene glycol in the reactor that stirrer, condenser and thermometer are equipped with, slowly drop into reactor 22.8 grams (0.1 moles) of tetraethyl titanate, separate out white precipitate, in After reacting at 70°C for 2 hours, the product was centrifuged, and the residue was washed with distilled water three times, and the product was vacuum-dried at 70°C. A white powdery substance was obtained.

[0040] The dried white powdery substance is placed in a reactor with agitator, condenser and thermometer, and 2.1 grams (0.02 moles) of sodium carbonate, 28 grams (0.2 moles) of trimethyl phosphate and 200 grams of ethylene glycol are added , reacted at a reaction temperature of 150°C for 3 hours until the system became a homogeneous liquid, and catalyst B was obtained.

[0041] Preparation of polyester

[0042] A polyester was prepared in the same manner as in Example 1, using Catalyst B as a catalyst (10 ppm by weight of titanium atoms bas...

Embodiment 3

[0045] Add 36.9 grams (0.6 mol) of ethylene glycol in the reactor that stirrer, condenser and thermometer are equipped with, in reactor, slowly drip into tetraisopropyl titanate 28.4 grams (0.1 mol), separate out white precipitate, After reacting at 70°C for 2 hours, the product was centrifuged, and the residue was washed with distilled water three times, and the product was vacuum-dried at 70°C. A white powdery substance was obtained.

[0046] The dried white powdery substance is placed in a reactor with a stirrer, a condenser and a thermometer, and 1.64 grams (0.02 moles) of sodium acetate, 14 grams (0.1 moles) of trimethyl phosphate and 200 grams of ethylene glycol are added , react at a reaction temperature of 150° C. for 3 hours until the system becomes a homogeneous liquid, and catalyst C is obtained.

[0047] Preparation of polyester

[0048] A polyester was prepared in the same manner as in Example 1, using Catalyst C as a catalyst (10 ppm by weight of titanium atoms...

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PUM

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Abstract

The invention relates to a manufacturing method of a polyester, which mainly solves the problems that dihydric alcohol compounds of titanium have poor solubility in glycol and the manufactured polyester has poor hue with the prior art. The manufacturing method takes dicarboxylic acids and alkylidene diols as raw materials, carries out an esterification reaction on conditions of a titanium-including catalyst, temperature of 230 DEG C to 280 DEG C and reaction pressure of the normal pressure to 0.5MPa to obtain a prepolymer; and then a condensation polymerization is carried out to obtain a product of polyester; the technical proposal that the product from the reaction of titanium compound, dihydroxy alcohol and at least one metallic compound selected from the IA column in the periodic table of (chemical) elements is used as the catalyst for the reaction of dicarboxylic acids and alkylidene diols can solve the problem and be used in the industrialized production of polyester.

Description

technical field [0001] The present invention relates to a kind of production method of polyester. Background technique [0002] Polyester, such as polyethylene terephthalate, has excellent mechanical, physical and chemical properties, and is widely used in various fibers, films, sheets and other products. [0003] The research on polyester catalysts has never stopped since the advent of polyester. At present, the polyester catalysts with more industrial production and research are mainly three series of catalysts: antimony, germanium and titanium. Among them, the most commonly used antimony series catalysts (including Sb 2 o 3 , SbAc 3 and ethylene glycol antimony, etc.), currently 90% of polyester in the world is produced by antimony catalysts. The disadvantages of antimony-based catalysts are: low activity; heavy metal catalysts pollute the environment; polymers are gray. The germanium-based catalyst has good stability, causes fewer side reactions during the reaction ...

Claims

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Application Information

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IPC IPC(8): C08G63/16C08G63/78C08G63/85C08G63/87
Inventor 夏燕敏魏高富熊金根戴志彬谭宏亮陆龙
Owner CHINA PETROLEUM & CHEM CORP
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