Naphtha adsorbing separation and optimized utilization method

Abstract

The invention provides a naphtha adsorbing separation and optimized utilization method. The method comprises the following steps: 1, filling naphtha into a simulation moving bed adsorbing separator filled with 5A molecular sieves under a liquid phase maintenance condition; 2, obtaining desorption effluents and raffinate effluents through a liquid-solid absorbing separation continuous technology; and 3, respectively recovering the desorption effluents and the raffinate effluents by a desorption agent to obtain desorption oil rich in n-alkanes and raffinate oil rich in non-normal alkanes, wherein the desorption oil contains 90-100wt% of the n-alkanes, and the raffinate oil contains 90-100wt% of the non-normal alkanes. The invention also provides a naphtha optimized utilization method. The adsorbing separation method provided in the invention, which has the advantages of low operation temperature, continuous operation, high yield, low desorption agent loss, and high molecular sieve utilization rate, couples a separating technology with subsequent processing technologies, and realizes the reasonable configuration of a resource.

Description

technical field [0001] The invention relates to a naphtha adsorption separation and optimal utilization method, more specifically to a molecular sieve simulated moving bed liquid-solid adsorption separation continuous process to efficiently separate normal paraffins and non-normal paraffins in naphtha at the molecular level so as to realize optimization method of use. Background technique [0002] Naphtha refers to the light fraction in crude oil from the temperature at which atmospheric distillation starts (that is, the initial boiling point) to 200°C (or 180°C), and the carbon number of its hydrocarbon composition is distributed between C 4 ~C 10 between. The main components are normal paraffins, isoparaffins, naphthenes and aromatics, wherein the content of normal paraffins is 20%-50%, and the content of non-normal hydrocarbons is 50%-80%. [0003] The traditional petroleum processing process adopts the strategy of fraction management, that is, according to the distill...

AI Technical Summary

Problems solved by technology

If this scheme is applied to the separation of n-alkanes in naphtha with a carbon number of 5-10, effective separation cannot be obtained

This may be due to the fact that the lighter hydrocarbon components are difficult to achieve liquid phase operation during the separation process, and the intermolecular replacement adsorption and desorption capabilities of different n-alkanes are weak, which makes it difficult to separate

[0007] Chinese patent CN 1621497A discloses a method for optimizing the utilization of naphtha. This technology adopts the method of extraction and separation to separate naphtha into raffinate oil and extracted oil. The obtained extracted oil is used as the raw material of the reforming unit. Oil is used as the raw material of the ethylene cracking unit. Due to the selectivity of the extraction process, it is difficult to achieve the level of clear molecular management. The yield is significantly lower than that of n-paraffin-based raw materials

However, this technology is a batch operation process of gas-solid phase adsorption, which has problems such as low yield, difficulty in improving the utilization rate of bed molecular sieves, and the safety of naphtha heating and vaporization operations.

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