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Catalysis with titanium oxides

A technology of titanium compounds and catalysts, applied in the field of catalysts, can solve problems such as difficulties and expensive antimony

Inactive Publication Date: 2003-08-13
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, disposing of prior art toxic antimony is expensive and difficult in an environmentally responsible sense, so there is a strong incentive to find alternatives to antimony

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A 1 L resin kettle was provided equipped with a JiffyMixer stirrer with Electro-Craft Motomatic constant speed controller, heater, thermocouple, condenser and nitrogen sweep. Add 0.2g TiO in the kettle 1.5 Catalyst, 115ml ethylene glycol, 6.23μl concentrated phosphoric acid, 0.3% by weight passivated TiO 2 A delustering agent and 400 g of a low molecular weight ethylene terephthalate oligomer formed from ethylene glycol and terephthalic acid. The mixture was stirred at a stirring rate of 60 rpm at 280° C. and a vacuum below 1 torr (133 Pa) for 120 minutes, at which time the supply voltage provided to the controller of the vessel stirrer (as an indication of the torque applied to the stirrer , which is thus an indication of the viscosity of the reactants) reaches a limit value of 150 mv, and the resulting polymer is poured into cold water to quench the polymerization. The polymer solid was annealed at 150°C for 12 hours to crystallize and ground to pass through a 2mm s...

Embodiment 2

[0031] Ti 2 o 3 (1.25 g) was mixed with 228 ml of ethylene glycol and 400 g of a low molecular weight ethylene terephthalate oligomer formed from ethylene glycol and terephthalic acid. In a resin kettle as described in Example 1, the mixture was stirred at a rate of 60 rpm at 280°C and sub-1 torr vacuum and after stirring for 100 minutes, the voltage of the stirrer motor reached the limit voltage. The resulting polymer was quenched, annealed, ground and analyzed as described in Example 1. The color number of the obtained polymer was 58.34L, -0.80a, 0.28b. The polymer had an inherent viscosity of 0.58 dL / g, a weight average molecular weight of 26,000 and a Z average molecular weight of 40,100.

Embodiment 3

[0033] Ti 2 o 3 A titania catalyst was used with 150 g of the ethylene terephthalate oligomer described in Example 1, 10 g of ethylene glycol at a concentration of 76 ppm titania catalyst. In the resin kettle as described in Example 1, the mixture was stirred at a rate of 50 rpm for 60 minutes under vacuum below 1 torr, at which time the supply voltage value of the vessel's stirrer reached 120 mv. The resulting polymer was quenched, annealed, ground and analyzed as described in Example 1. The color numbers of the obtained polymer were 72.9L, -0.76a, 4.25b. The polymer had a weight average molecular weight of 48,200 and a Z average molecular weight of 73,900. Example 4

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Abstract

A process which can be used in oligomerization, polymerization, or depolymerization such as, for example, the production of a polyester is provided. The process comprises contacting a carbonyl compound, in the presence of a composition, with an alcohol. The catalyst comprises a catalyst having the formula of: MxTi<(III)>Ti<(IV)>yOx+3+4y / 2 wherein M is an alkali metal, Ti<(III)> is titanium in the +3 oxidation state, Ti<(IV)> is titanium in the +4 oxidation state, x and y are numbers greater than or equal to zero wherein if x equals zero, y is a number less than 1 / 2.

Description

field of invention [0001] The present invention relates to a method of using titanium oxide as a catalyst for oligomerization, polymerization, depolymerization or a combination of two or more thereof. Background of the invention [0002] Titanium oxides are known in the art. Among them, Nawata et al. (JP51081896) disclose the use of TiO 2 As a catalyst for the preparation of high molecular weight polyesters. Shtokoreva et al. (SU765290) listed Ti n o 2n-1 The use of wherein n=3-7. The molecular formula of these compositions Ti n o 2n-1 can be equivalently written as TiO x [x=(2n-1) / n], where x is between 5 / 3 (n=3) and 13 / 7 (n=7). Titanium oxide has various industrial uses. [0003] The preparation of polyesters from the polycondensation of diols and hydrocarbyl diacids is well known in the art, as described in John Wiley and Sons, Encyclopedia of Polymer Science and Engineering, 2nd Edition, Volume 12, New York (1988) the same. The most commo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/85
CPCC08G63/85
Inventor S·R·卢斯蒂格R·R·布尔赫小E·M·麦卡伦
Owner EI DU PONT DE NEMOURS & CO