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Method for preparing titanium dioxide catalyst for polyester in alkane solvent
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A technology of polyester catalyst and titanium dioxide, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, nanotechnology, etc., can solve the problems of large particle size distribution and poor dispersion, and achieve high preparation efficiency, low energy consumption and catalytic performance Good results
Pending Publication Date: 2021-10-22
ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD +1
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[0006] The present invention is to overcome the problems of large particle size distribution and poor dispersion in the catalytic process of existing titanium-based polyester catalysts, and provides a method for preparing titanium dioxide polyester catalysts in alkane solvents. The present invention selects liquid alkane as the oil phase, by changing The ratio of anionic surfactant to co-surfactant and the temperature of the water bath during the microemulsion reaction can prepare titanium dioxide nanoparticles with rich microscopic morphology, and obtain a titanium polyester catalyst with high specific surface area, good dispersibility and catalytic effect
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Embodiment 1
[0039] A method for preparing nano titanium dioxide polyester catalyst, comprising the steps of:
[0040] (1) Take 100 parts of cyclohexane, 20 parts of sodiumdodecyl sulfate (trade name SDS), 10 parts of n-butanol and 10 parts of 0.6mol L -1 TiCl 4 Solution, stir well to make it evenly mixed, and make reaction component A.
[0041] (2) Take 100 parts of cyclohexane, 20 parts of SDS, 10 parts of n-butanol and 10 parts of 2.4mol L -1NH 3 ·H 2 0 solution, stir well to make it evenly mixed, and make reaction component B.
[0042] (3) Add the reaction component B dropwise to the reaction component A, stir at 30°C for 4 hours, fully react so that the whole system becomes milky white;
[0043] (4) adding ethylene glycol into the reaction system, and distilling off liquid alkane and water to obtain a titanium-based catalyst for polyester.
Embodiment 2
[0045] A method for preparing nano titanium dioxide polyester catalyst, comprising the steps of:
[0046] (1) Take 100 parts of cyclohexane, 20 parts of ammonium lauryl sulfate (trade name ALSA), 10 parts of n-butanol and 10 parts of 0.6mol L -1 TiCl 4 Solution, stir well to make it evenly mixed, and make reaction component A.
[0047] (2) Take 100 parts of cyclohexane, 20 parts of ALSA, 10 parts of n-butanol and 20 parts of 2.4mol L -1 NH 3 ·H 2 0 solution, stir well to make it evenly mixed, and make reaction component B.
[0048] (3) Add the reaction component B dropwise to the reaction component A, stir at 50° C. for 4 hours, fully react so that the whole system becomes milky white;
[0049] (4) adding ethylene glycol into the reaction system, and distilling off liquid alkane and water to obtain a titanium-based catalyst for polyester.
Embodiment 3
[0051] A method for preparing nano titanium dioxide polyester catalyst, comprising the steps of:
[0052] (1) Take 100 parts of cyclohexane, 20 parts of ammonium lauryl polyoxyethylene ethersulfate (trade name AESA), 10 parts of n-butanol and 10 parts of 0.6mol L -1 TiCl 4 Solution, stir well to make it evenly mixed, and make reaction component A.
[0053] (2) Take 100 parts of cyclohexane, 20 parts of AESA, 10 parts of n-butanol and 20 parts of 2.4mol L -1 NH 3 ·H 2 0 solution, stir well to make it evenly mixed, and make reaction component B.
[0054] (3) Add the reaction component B dropwise to the reaction component A, stir at 30°C for 6 hours, fully react so that the whole system becomes milky white;
[0055] (4) adding ethylene glycol into the reaction system, and distilling off liquid alkane and water to obtain a titanium-based catalyst for polyester.
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Abstract
The invention relates to the technical field of catalyst preparation, and discloses a method for preparing a titanium dioxide catalyst for polyester in an alkanesolvent aiming at the problems that the existing titanium catalyst for polyester is large in particle size distribution and poor in dispersity in a catalysis process. The method comprises the following steps: fully stirring and uniformly mixing a soluble salt solution of titanium, liquid alkane, an anionic surfactant and a cosurfactant to obtain a reaction component A; fully stirring and uniformly mixing an alkaline solution, liquid alkane, an anionic surfactant and a cosurfactant to obtain a reaction component B; dropwise adding the reaction component B into the reaction component A, and reacting for a period of time at a certain temperature; and after the reaction is finished, adding ethylene glycol into a reaction system, and distilling to remove liquid alkane and waterso as to obtain the titanium catalyst for polyester. The titanium catalyst for polyester, which is high in specific surface area and good in dispersity and catalytic effect, is prepared by changing the proportion of the anionic surfactant and the cosurfactant and the water bath temperature in the microemulsion reaction process.
Description
technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to a method for preparing a titanium dioxide polyester catalyst in an alkane solvent. Background technique [0002] Polyethylene terephthalate (PET) is the most important variety of thermoplastic polyester. It is a polycondensate of terephthalic acid (PTA) and ethylene glycol (EG), commonly known as polyester polyester, and is widely used in Chemical fiber, packaging, film and other fields. At present, the industrial production method of PET is mainly the direct esterification method, which is the method of direct reaction between terephthalic acid and ethylene glycol. This method includes two stages of esterification reaction and polycondensation reaction, and the reaction in the polycondensation stage requires a catalyst. Participation accelerates the reaction. At present, antimony-based catalysts are mainly used in industrial production, but antimony, as a heavy me...
Claims
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