Method for preparing lactic acid by catalyzing pyruvic aldehyde
A technology of aceglyoxal and lactic acid, applied in the direction of oxidative preparation of carboxylic acid, chemical instruments and methods, molecular sieve catalyst, etc., can solve the problems of large-scale production and application of lactic acid, air pollution, large solid waste, etc. Large-scale industrial production application, high conversion rate of aceglyoxal, and effect of improving reaction efficiency
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Embodiment approach
[0049] According to the first embodiment, preferably the tin-titanium-silicon molecular sieve is at 460 cm in the FT-IR spectrum -1 、975cm -1 、800cm -1 and 1080cm -1 There is absorption nearby. Preferably, the tin-titanium-silicon molecular sieve has absorption at 200-300 nm in the UV-Vis spectrum, preferably at 200-260 nm.
[0050] According to the first embodiment, preferably the molar ratio of the tin element to the silicon element in the tin-titanium-silicon molecular sieve is 0.05-10:100, more preferably 0.1-5:100, particularly preferably 0.2-2:100. Preferably, the molar ratio of titanium element to silicon element in the tin-titanium-silicon molecular sieve is 0.05-10:100, more preferably 0.1-5:100, particularly preferably 0.5-4:100. Such proportions of tin, titanium and silicon can further optimize the catalytic activity of the tin-titanium-silicon molecular sieve of the present invention.
[0051] According to the first embodiment, it is preferred that the tin-tit...
preparation Embodiment 1
[0095] In this preparation example, a Sn-Ti-MFI-1 molecular sieve is prepared according to the method of Example 1 of the Chinese patent CN 105217645A specification, and the specific preparation method is as follows:
[0096] (1) At 25°C, stirring and contacting tetrapropylammonium hydroxide aqueous solution (concentration: 15% by weight) with tetrabutyl titanate and tin tetrachloride pentahydrate for 30 minutes to obtain a mixture;
[0097] (2) At 60°C, add silicon molecular sieve S-1 to the above mixture and stir for 0.5h to obtain the mixture (during this contact process, add water or not add water as required, if the feeding in step (1) can meet the requirement of water Feeding requirements, there is no need to add water, if it is not met, you can add water when the mixture containing tetrapropylammonium hydroxide, tetrabutyl titanate and tin chloride is stirred and contacted with silicon molecular sieve, or distill off water, and the rest The preparation examples are simi...
preparation Embodiment 2
[0101] This preparation example prepares the Sn-Ti-MFI-2 molecular sieve according to the method of the Chinese patent CN105217645A specification example 2, and the specific preparation method is as follows:
[0102] (1) At 25°C, stirring and contacting tetrapropylammonium hydroxide aqueous solution (concentration: 20% by weight) with tetrabutyl titanate and tin tetrachloride pentahydrate for 30 minutes to obtain a mixture;
[0103] (2) At 25°C, add silicon molecular sieve S-1 to the above mixture and stir for 0.5h to obtain the mixture; wherein, ensure that the molar ratio of each substance is: silicon source (silicon molecular sieve): alkali source template (four Propyl ammonium hydroxide): titanium source (tetrabutyl titanate): tin source (tin tetrachloride): water=100:15:2:0.1:200, wherein the silicon source is SiO 2 In terms of titanium source as TiO 2 Tin source is calculated as tin element;
[0104] (3) Transfer the above mixture into a sealed stainless steel reaction...
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Abstract
Description
Claims
Application Information
- IPC
- C07C51/16; C07C59/08; B01J29/40
- CPC
- C07C51/16; B01J29/405; C07C59/08; Y02P20/584
- Inventors
- 朱斌; 刘聿嘉