A method for the removal of acetylenes by hydrocarbon dihydrogenation

By employing a Fe-Pd-Ni-Cu hydrogenation catalyst and utilizing microemulsion and solution loading methods, the problem of catalyst coking under high C4 conditions was solved, achieving high catalyst activity and selectivity and extending the stable operation time of the unit.

CN117164424BActive Publication Date: 2026-07-03PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
PETROCHINA CO LTD
Filing Date
2022-05-27
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Under high C4 conditions, existing C2 hydrogenation catalysts are prone to coking, which leads to a decrease in catalyst activity and selectivity, affecting the long-term stable operation of the unit. The problem is particularly serious when the C4 content exceeds the standard.

Method used

The Fe-Pd-Ni-Cu hydrogenation catalyst was used, and the catalyst was supported by both microemulsion and solution methods. Fe and Pd were mainly distributed in the micropores, while Ni/Cu were distributed in the macropores. This reduced the reduction temperature and the degree of coking of the catalyst, and improved the selectivity and activity of the catalyst.

Benefits of technology

It effectively reduced the reduction temperature of the catalyst, reduced coking, extended the catalyst's service life, and maintained high activity and selectivity. It can even effectively remove alkynes and dienes under high C4 content conditions.

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Abstract

This invention discloses a method for removing alkynes via C2 hydrogenation, particularly under high C4 conditions. Using a hydrogenation catalyst, the overhead effluent from the pre-propane stripper in an ethylene plant is selectively hydrogenated in a three-stage tandem reactor in an adiabatic bed to remove alkynes and dienes. Reaction conditions: reactor inlet temperature 50–100°C, pressure 1.5–4.5 MPa, space velocity 8000–20000 h⁻¹. ‑1 The preferred reaction conditions are: inlet temperature 60–90℃, pressure 2.5–4.0 MPa, and volumetric hourly space velocity 10,000–14,000 h⁻¹. ‑1 The catalyst support is alumina or primarily alumina, exhibiting a bimodal pore structure. The catalyst contains at least Fe, Pd, Ni, and Cu, with Pd supported in both microemulsion and solution formats. Ni and Cu are supported in microemulsion, while Fe is supported in solution. The Ni, Cu, and Pd supported in the microemulsion are mainly distributed within the macropores of the support. This catalyst exhibits a low reduction temperature and excellent catalytic performance and anti-coking properties.
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