Aromatics Production Technology (RHAROM)
Ruihua aromatics production technology can be used to produce benzene, toluene and xylene products. This technology is highly adaptable to the market, and the product scheme can be adjusted according to demand, and it is very competitive in small and medium-sized industrial applications.
The raw material for this technology can start from benzene or toluene. When the starting material is benzene, benzene is firstly alkylated with methanol to produce toluene, and then toluene is form-selectively disproportionated to produce high-concentration crude p-xylene and benzene. Benzene is recycled. The crude p-xylene is refined by crystallization. High-purity para-xylene, mixed xylene and a small amount of C9 aromatics; when the starting material is toluene, toluene is directly disproportionated to produce crude para-xylene and benzene. The product scheme is high-purity para-xylene, benzene, mixed xylene and a small amount of C9 Aromatics.
The technology consists of two parts: benzene and methanol alkylation and toluene shape selective disproportionation. The configuration of the alkylation and disproportionation parts can be matched according to the scale, or different proportions can be adopted according to the plant conditions.
The alkylation reaction is carried out in a multi-bed fixed-bed reactor. The vaporized benzene enters the reactor directly from the first bed, and the vaporized methanol enters each catalyst bed in stages. In the reactor, methanol and benzene undergo an alkylation reaction to produce toluene, xylene, C9 aromatics, etc. with high selectivity. The conversion rate of methanol in a single pass is 100%, and the selectivity of toluene to benzene is 91-95%. The selectivity of methanol is 85~90%. After the product is separated and refined, the purity of the toluene obtained is greater than 99.9%.
The disproportionation reaction is carried out in a fixed-bed reactor. The vaporized toluene enters the bed of the shape-selective disproportionation catalyst. The toluene disproportionates to form benzene and xylene. Due to the shape-selectivity of the catalyst, the xylene in the product can break through the equilibrium composition and obtain a high concentration of Para-xylene stream, the selectivity of para-xylene in the xylene stream reaches 90%. The generated disproportionation product is stably degassed, and after purification and separation, the purity of crude p-xylene is about 85%, and the purity of benzene reaches 99.9%.
The benzene used for alkylation can be petroleum benzene or coking benzene; the raw material methanol needs to meet the requirements of GB 338-2011.
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