Improved light aromatic hydrocarbon hydrogenation device and operation method thereof

Abstract

The invention relates to the technical field of light aromatic hydrocarbon hydrogenation equipment, and discloses an improved light aromatic hydrocarbon hydrogenation device. The improved light aromatic hydrocarbon hydrogenation device comprises a first de-weighting tower, a first tower bottom pump is connected to the bottom end of a left side of the first de-weighting tower through a pipeline, the left end of the first tower bottom pump is fixedly connected with a raw material input pipe, a first bottom product discharge pipe is fixedly communicated with the right end of the first tower bottom pump, the bottom end of the first de-weighting tower is connected with a first reboiler through the pipeline, and the left end of the top surface of the first reboiler is in fixed communication withthe right side surface of the first de-weighting tower through the pipeline. According to the improved light aromatic hydrocarbon hydrogenation device and an operation method thereof, by the cooperation of a hydrogenation feeding pump, a hydrogenation primary heat exchanger, a hydrogenation secondary heat exchanger, an electric heater, a first main hydrogenation reactor and a second main hydrogenation reactor, the two-stage main hydrogenation is carried out on the high-purity liquid light component oil, the problem of coking of the high-purity liquid light component oil in a main hydrogenation process can be avoided, and the practicability of the improved light aromatic hydrocarbon hydrogenation device is increased.

Description

technical field [0001] The invention relates to the technical field of light aromatics hydrogenation equipment, in particular to an improved light aromatics hydrogenation device and an operating method thereof. Background technique [0002] Light Aromatics Aromatics is a complex nine-carbon aromatics mixture, mainly from the xylene bottom oil of the reforming unit of the refinery and the by-products of ethylene production. The by-products produced in the ethylene production process contain a large number of unsaturated components. In cracking heavy aromatics, light aromatics account for about 80%, and the distillation range is 140-220°C. The composition is very complex and the boiling point is close. It is difficult to carry out fine separation. It is not suitable for separation and utilization. It is mainly used as fuel, and the economic benefit is not high. In order to To make full use of the by-products produced in the ethylene production process, people often process the...

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Problems solved by technology

[0004] The invention provides an improved light aromatics hydrogenation device and its operation method, which has the advantages of two-stage hydrogenation, high impurity removal efficiency and energy saving, and solves the problem that the existing light aromatics hydrogenation device can only perform single-stage hydrogenation , the light light aromatics fraction in the hydrogenation tank is easy to coke during the hydrogenation process of light aromatics, resulting in a decrease in the hydrogenation yield of light aromatics, and it cannot effectively remove impurities such as sulfides, nitrides, and oxides in oil products and partially unsaturated hydrocarbons, resulting in deterioration of oil properties and failing to meet product requirements. At the same time, the energy utilization rate is very low, wasting a lot of energy, and increasing the production cost of oil products.

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