Catalyst for preparing 1,2-propylene glycol by glycerol hydrogenation and use thereof

Abstract

The present invention provides a catalyst for preparing 1, 2-trimethylene glycol using glycerol and hydrogen, and its application. The catalyst precursors are prepared by coprecipitation method or immersion method, the constitute of non-oxygen element is Cu-Zr-A, A is one selected from titanium, tungsten or molybdenum, Cu is 4-40% by weight percentage composition of the catalyst precursors, A / Zr ratio is 0.1-10; the catalyst being reduction activation in hydrogen stream under 200-450 Celsius before being used. The catalyst shows excellent catalyzing effect in the preparing course of the 1, 2-trimethylene glycol using glycerol and hydrogen, and lower hydrogen pressure, reacting temperature, high selectivity and life.

Description

technical field [0001] The invention relates to a catalyst for preparing 1,2-propanediol by hydrogenation of glycerin, a preparation method of the catalyst and its application in hydrogenation reaction of glycerin. Background technique [0002] The shortage of oil resources in the world has further increased the price of oil, and many countries are actively looking for alternatives to oil. Biodiesel is a clean and renewable energy. It is a liquid made from oil crops such as soybeans and rapeseeds, oil-bearing forest fruits such as oil palm and pistachio, engineering microalgae and other oil-bearing aquatic plants, animal fats, and waste cooking oil. Fuel is a high-quality petroleum diesel substitute. However, the rapidly rising investment in biodiesel has resulted in a surplus of by-product glycerin in the production process. About 100 grams of glycerol is produced for every 1000 grams of biodiesel produced. Therefore, finding new ways to utilize these glycerols has attrac...

AI Technical Summary

Problems solved by technology

However, the patent uses gaseous glycerin and a very high ratio of hydrogen to glycerin, which leads to high energy consumption and greatly increases the operating cost of the device. In addition, due to the high boiling point of glycerin, its gasification will inevitably lead to coking of part of glycerin, which will affect production. Unit consumption

[0007] Chinese patent CN200710043082.8 discloses a method for preparing 1,2-propanediol with a ternary composite oxide catalyst for hydrogenation of glycerol, but this method does not describe the preparation method of the catalyst, and adopts a smaller ratio of hydrogen to glycerin (3:1 ~ 15:1), so that the reaction temperature is high, the heat of reaction cannot be removed quickly, resulting in an increase in by-products, which will shorten the service life of the catalyst

[0008] In view of the problems of high reaction pressure, high operating cost, and short catalyst life in the glycerol hydrogenation process in the above patent, the present invention adopts a trickle bed liquid-phase catalytic reaction process, using highly active Cu-Zr-A as a catalyst, with a raw material concentration of High, low hydrogen pressure, moderate molar ratio of hydrogen to glycerol, low reaction temperature, high selectivity and long life