A purification process for separating beta-methylnaphthalene from a wash oil fraction

By combining a baffled distillation column with selective oxidation desulfurization technology, the problem of achieving high purity and high yield in the separation of β-methylnaphthalene from wash oil fractions was solved, realizing an efficient and low-energy separation process, reducing equipment footprint and mother liquor loss, and lowering costs.

CN122404089APending Publication Date: 2026-07-17CCTEG CLEAN ENERGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CCTEG CLEAN ENERGY CO LTD
Filing Date
2026-05-06
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing technologies struggle to strike a balance between high purity and high yield. Traditional methods are energy-intensive, require large equipment footprints, suffer significant mother liquor loss, and are heavily polluting due to chemical methods, making it difficult to efficiently separate β-methylnaphthalene from wash oil fractions.

Method used

The reaction-separation coupling design is adopted, and a partitioned distillation column is used to separate the three components in the same column. Combined with selective oxidation desulfurization technology, benzothiophene sulfur impurities are converted into high-boiling-point sulfones under mild conditions. High purity and high yield are achieved through oxidation treatment and simple distillation.

Benefits of technology

The purity of β-methylnaphthalene reached over 99.5%, the yield increased to 76.4%, energy consumption was reduced by 25-35%, the number of equipment was reduced by 67%, investment costs were reduced by 30-40%, and no hazardous waste was generated, meeting the requirements of green chemical industry.

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Abstract

The present application relates to a kind of purification methods for separating β-methylnaphthalene from wash oil fraction, it is related to coal chemical fine separation technical field, including: if the mass percentage content of nitrogen-containing substance in wash oil fraction is >0.5%, then wash oil fraction is sequentially subjected to denitrogenation treatment and rectification, otherwise directly rectification;The crude β-methylnaphthalene product is obtained by side line in the rectification;The crude β-methylnaphthalene product is sequentially subjected to oxidation treatment and refining separation, and the β-methylnaphthalene product with purity ≥99.5% is obtained.The purification method provided by the present application realizes the unity of high purity and high yield by reaction-separation coupling design, the rectification section does not pursue the ultimate purity to provide suitable raw material for oxidation treatment, and the oxidation treatment avoids the defect that solid solution is formed in subsequent separation, and the system total yield is improved to 80-85% from 45-60% of traditional method by simple distillation in refining separation.
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