Multistage hydrogen dissolution liquid phase hydrogenation reaction method

Abstract

The invention relates to a multistage hydrogen dissolution liquid phase hydrogenation method. The method is as below: mixing a cycle liquid material with raw oil, and heating in a heating furnace; introducing the hydrogen divided into n paths into a heating furnace for heating; mixing a first path of hydrogen and liquid phase material in a mixer to conduct a first stage of hydrogen dissolution, sending the rest (n-1) paths of hydrogen through an inlet of a reactor bed layer into a hydrogen oil mixture component of the reactor, and mixing the (n-1) paths of hydrogen with a mixture from reaction of a previous bed layer, so as to conduct a second stage of hydrogen dissolution, conducting stripping to obtain reaction by-products hydrogen sulfide and ammonia, arranging a reaction pressure control system on the top of the reactor, and arranging an exhaust system in each stage of reactor; and sending the reaction products into a stripping tower, arranging a hydrogen oil mixer in the stripping tower, conducting stripping to obtain by-products hydrogen sulfide and ammonia to enhance hydrogen solubility, sending part of the oil product from tripping into a product tank, and a recycling the other part of the oil product. The method discharges hydrogen sulfide and ammonia from the reactor system while conducting a catalytic hydrogenation reaction, a solid-phase catalyst contacts with a liquid phase reactant to improve the efficiency of reaction.

Description

technical field [0001] The invention relates to a liquid-phase hydrogenation reaction method for multi-stage hydrogen dissolution, in particular to a process method for product circulation liquid-phase hydrogenation treatment. Background technique [0002] As people's awareness of environmental protection continues to increase, many countries have adopted environmental legislation to limit the sulfur content of diesel to a very low level (10-15μg / g) to reduce harmful gas emissions and improve air quality. The United States reduced the sulfur content in diesel to 15 μg / g in 2006. Germany reduced the sulfur content to 10μg / g in January 2003. Other EU countries and Japan reduced the sulfur content to 10μg / g in 2008. my country's urban vehicle diesel national standard GB19147-2009 is formulated with reference to the European Class III standard, and its sulfur content is required to be less than 350 μg / g. The sulfur content of diesel fuel in the fifth phase of vehicle gasoline...

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Problems solved by technology

But it does not completely solve the H that will be produced during the hydrofining reaction 2 S, NH 3 The problem of removal of harmful impurities such as sulfide and other harmful impurities leads to their continuous accumulation in the reactor, which greatly reduces the reaction efficiency and cannot effectively handle raw materials with high sulfur and nitrogen content. The above-mentioned documents do not disclose the specific structure of the reactor

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