Method for hydrocarbon raw material steam thermal cracking

Abstract

The invention relates to a method for hydrocarbon raw material steam thermal cracking. According to the method, one or more tree-like branched polymers are adopted as active aids to be put into a cracking raw material and cracked simultaneously or cracked in sequence in the thermal cracking process, and cracking of a hydrocarbon raw material is initialized and induced, so that the reaction velocity is increased, the reaction temperature is reduced, and product distribution can be regulated and controlled. The tree-like branched polymers used in the method comprise polyolefin, poly(ether-ester), polyether, polyamide, polyurethane, polysilane and the like, and the addition amount of the polymers is within 0.001-10%.

Description

technical field [0001] The present invention relates to a process for the conversion of a hydrocarbon feedstock by steam thermal cracking to at least one olefin-containing product comprising at least ethylene. Background technique [0002] Light olefins are important chemical raw materials, mainly obtained through petroleum cracking. With the development of society, the demand for low-carbon olefins is constantly increasing. According to the current production speed and the increasing capacity of the existing equipment, it is expected that the supply will remain in short supply for a long time, which prompts people to seek more efficient production processes and technologies. [0003] At present, the thermal cracking of hydrocarbons is the basic method for the industrial production of low molecular weight olefins, namely ethylene and propylene. The raw materials are generally hydrocarbons with two or more carbon atoms in the molecule. The mainstream process in the industr...

AI Technical Summary

Problems solved by technology

Further reductions in tube diameter become unhelpful for the following reasons: first, the effect of broadening the residence time distribution due to the presence of the boundary layer becomes progressively more apparent with further reductions in tube diameter; The significant change in temperature in the boundary layer of the wall makes the optimal reaction time required by the reactants at different positions in the direction of the pipe diameter change greatly, and it is difficult to find the balance point of the optimal residence time.

What makes the problem more serious is that the temperature at the pipe wall is high and the residence time is long, which accelerates the coking reaction sharply.

[0007] At present, the commonly used technologies in industry to increase the relative rate of the main reaction are close to the economically feasible limit. Although there are still some methods such as increasing turbulence through pipe fittings in the furnace tube, the effect is limited when the flow rate in the tube is already high.