Preparation method of loaded solid catalyst used in deacidification of high-acid-value grease

Abstract

The invention relates to a preparation method of a loaded solid catalyst, in particular to a preparation method of a loaded solid catalyst used in deacidification of high-acid-value grease. In the method, a SiO2-based mesoporous molecular sieve with a dual-model duct structure is taken as a carrier; one of super acids such as phosphotungstic acid, phosphomolybdic acid, zirconium phosphate, phosphorus niobate and the like is loaded for serving as an active ingredient; in the deacidification process of high-acid-value waste grease, the acid value can be lowered from initially 30-100 mg KOH / mL to 5-10 mg KOH / mL; and the catalyst has the characteristics of high catalytic activity, easiness for separating and recovering, no corrosion of equipment by a reaction system, environmental friendliness and the like.

Description

Technical field: [0001] The invention belongs to the field of environmental catalysis and energy technology, and in particular relates to a SiO with dual-model pore structure. 2 Preparation method of supported solid acid catalyst based on mesoporous molecular sieve and its application in acid reduction treatment of waste oil with high acid value. Background technique: [0002] At present, raw material oil accounts for about 70% of the production cost of biodiesel. With the rapid development of social economy and the continuous improvement of people's living standards, a large number of waste edible oils are produced. How to use these waste edible oils to produce biodiesel , has become the focus of widespread attention in recent years, and has become an effective way to reduce the cost of biodiesel. [0003] The most commonly used method to produce biodiesel is to use animal and vegetable oils and alcohols to undergo alcohol transesterification through solid alkali catalysts...

AI Technical Summary

Problems solved by technology

[0003] The most commonly used method to produce biodiesel is to use animal and vegetable oils and alcohols to undergo alcohol transesterification through solid alkali catalysts, but waste oils and fats contain a large amount of free fatty acids and polymers, resulting in too high acid values. If these high If the acid value waste oil is converted into biodiesel, then the solid base catalyst will be deactivated quickly due to poisoning

Therefore, these waste oils with high acid value cannot be directly used as raw materials for the production of biodiesel by the alkali-catalyzed method.

[0004] CN101092569A, CN101063040A, CN1382762A, CN1412278A and other Chinese patents report the method of preparing biodiesel with waste oil with high acid value as raw material, but due to the use of homogeneous catalytic route, the catalytic efficiency is not high, and the equipment is severely corroded

US4652406, CN1556174, CN101074390 and other patents use pretreatment to reduce the acid value, but the process is complicated, the production cycle is long, and the energy consumption is high

CN1887417A, CN101067091A and other patents propose to use composite rare earth solid acid catalyst for pretreatment, but the catalyst composition is complex and the production cost is high

The CN1904013A patent uses a fixed bed reaction path to reduce the acid value, but this method requires high temperature and high pressure conditions

[0005] It can be seen from this that in the process of biodiesel preparation using high acid value oils and fats as raw materials, if solid base catalyzed transesterification technology is simply used, the resulting biodiesel must have low catalytic efficiency and high production costs. and the disadvantages of time-consuming and energy-consuming