A method for rapidly synthesizing high-titanium-content titanium-silicon molecular sieve ts-1 under normal pressure using crystallization mother liquor

Abstract

The invention discloses a method for rapidly crystallizing and synthesizing a titanium-silicon molecular sieve TS‑1 with uniform size and small grains and high titanium content under normal pressure. Compared with the TS-1 molecular sieve synthesis technology reported in the present invention, the TS-1 molecular sieve preparation technology proposed by the present invention has the following advantages: (1) Crystallization at 90-99.5°C under normal pressure at 24-60 The rapid synthesis of TS-1 molecular sieves with high titanium content can be achieved within hours, and this method is especially suitable for the large-scale production of TS-1 molecular sieves; (2) The template agent can be recycled, so it can not only greatly reduce the production cost of TS-1 molecular sieves (3) no inorganic alkali is used; (4) the utilization rate of silicon and titanium is close to 100%; (5) the synthesized TS-1 molecular sieve crystals have uniform size and relatively small crystal grains. Small (150-200nm), as a catalyst or catalyst carrier, it is more conducive to the mass transfer and diffusion of reactants and products.

Description

technical field [0001] The invention belongs to a method for preparing molecular sieves, in particular to a method for rapidly synthesizing TS-1 molecular sieves with high titanium content under normal pressure and low temperature conditions. Background technique [0002] Titanium silicate molecular sieve TS-1 is widely used as a catalyst in many reactions, such as ammoximation of cyclohexanone, epoxidation of alkenes, oxidation of alcohols, partial oxidation of alkanes, hydroxylation of benzene and phenol, and methanol to alkenes reaction. [0003] Titanium silicate molecular sieve TS-1 was first reported by Taramasso et al. (U.S. Patent 4,410,501) in 1983. [0004] In 2016, Chen Lihua et al. (CN104058423B) disclosed a method of hydrothermal crystallization at 100-130°C in a hydrothermal kettle using ethyl orthosilicate as the silicon source and titanium isopropoxide or butyl titanate as the titanium source. 10-12h Synthesis of TS-1 technology. [0005] In 2016, Xiong Gu...

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Problems solved by technology

[0014] So far, in any published literature, there is no research report on the rapid synthesis of TS-1 molecular sieve at normal pressure and temperature below 100 °C, especially the rapid synthesis of TS with high titanium content under such conditions -1 molecular sieve, a research report on the rapid synthesis of the TS-1 molecular sieve by recycling the mother liquor

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