Low carbon olefin oligomerization process control method

Abstract

The invention relates to a low carbon olefin oligomerization process control method. The method comprises the following steps: (1) enabling a sodium dihydrogen phosphate water solution in an acid water tank to enter from the upper part of a neutralization sedimentation tank through an acid water pump; (2) inputting low carbon olefin and low pressure steam into a heater, and heating to respectively obtain low carbon olefin and low pressure steam condensate; discharging the low pressure steam condensate; enabling the low carbon olefin to enter from the bottom of the neutralization sedimentation tank; (3) enabling the low carbon olefin to contact with the sodium dihydrogen phosphate water solution reversely, and regulating and controlling the water content of the low carbon olefin according to a mode; (4) when the water content of the low carbon olefin is 200ppm-3000ppm, performing oligomerization on the low carbon olefin and a solid phosphoric acid catalyst, thus obtaining a reaction product; (5) enabling steam and water in a balanced state in a steam pocket to flow inside from the lower part of a reactor under potential difference action, and reacting with the reaction product obtained in the step (4), thus respectively obtaining C5-C16 olefin products and steam; enabling the steam to return to the steam pocket; detecting the C5-C16 olefin products by an online acidity analyzer, and then discharging. The low carbon olefin oligomerization process control method can achieve the aim of real-time monitoring.

Description

technical field [0001] The invention relates to the technical field of fine chemicals, in particular to a method for controlling the oligomerization reaction process of low-carbon olefins. Background technique [0002] Oligomerization of low-carbon olefins can not only obtain high-octane gasoline components, but also obtain high-carbon olefins, an important raw material for fine chemicals. Since the UOP company in the United States pioneered the use of solid phosphoric acid catalysts for olefin superposition in the 1930s, most of the oligomerization of propylene or butene still uses this superposition process. The device uses a solid phosphoric acid catalyst, the reactor is a Snamprogetti tubular reactor, and the reaction is carried out at a temperature of 160°C~220°C and a pressure of 4.8MPa~5.5MPa. [0003] The solid phosphoric acid catalyst is composed of phosphates with different degrees of polymerization and has a continuous distribution of degrees of polymerization. ...

AI Technical Summary

Problems solved by technology

The production plant of the solid phosphoric acid catalyst provides the user with a w-T (water content-temperature) diagram based on w=f(T) to maintain the operation. It is a "prior" model, and it is often used in industrial production due to The interference of some unknown factors and the existence of chaos in the process cause the drift of the optimization zone, which cannot keep the catalyst in the best state consistently, and this method cannot detect and solve the abnormal situation in actual production in time.

Images