Method for improving productivity of low carbon olefin hydrocarbon in biological oil and fat catalytic conversion reaction

Abstract

A method for improving yield of low-carbon alkenes in bio-oil catalytic transformation reaction comprises the following steps: preheating bio-oil materials, injecting into a catalytic transformation reactor, contacting and reacting with a catalyst containing modified beta-zeolite, injecting a hydrogen-rich gas into the reactor, separating the reacted oil gas from the catalyst with carbon deposition, separating the reacted oil gas to obtain the target product containing low-carbon alkenes, processing the catalyst with carbon deposition by stripping and regenerating, and adding into the reactor for recycling. By injecting the hydrogen-rich gas into the reactor, the method can remarkably inhibit the retransformation reaction after the generation of low-carbon alkenes, thus improving the yield of low-carbon alkenes. When a riser and fluidized bed reactor using lard as the raw materials is selected, the yields of ethylene, propylene and butylene are respectively 5.69 wt percent, 25.65wt percent and 15.78wt percent, which are respectively higher than the yields without the addition of the hydrogen-rich gas by 1.51 percent, 2.54 percent and 1.44 percent.

Description

Technical field [0001] The invention belongs to a method for catalytic conversion of biological oils, and more specifically, is a method for improving the yield of C2-C4 low-carbon olefins in the catalytic conversion of biological oils. Background technique [0002] At present, the production of low-carbon olefins worldwide is mainly based on the tube furnace steam cracking method with light petroleum hydrocarbons as raw materials and the catalytic cracking method with heavy petroleum hydrocarbons as raw materials. Petroleum hydrocarbon is a non-renewable resource. According to statistics, the world's proven petroleum hydrocarbon resources can only be exploited for about 80 years at the current level of exploitation. With the massive consumption of petroleum hydrocarbon resources and the declining reserves, the use of renewable bio-oil as an alternative resource for petroleum hydrocarbons to produce low-carbon olefins will be a beneficial supplement to the current low-carbon olef...

AI Technical Summary

Problems solved by technology

However, the inventors found through laboratory research: under the reaction conditions for preparing low-carbon olefins from bio-oil catalytic conversion and the presence of acidic zeolite, low-carbon olefins can be converted into other hydrocarbons, hydrogen and coke in large quantities and rapidly after they are generated. This leads to a significant decrease in the yield of low-carbon olefins

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