Aromatics Production Technology (RHAROM)

Summary:

Ruihua aromatics production technology can be used to produce benzene, toluene, xylene products. This technology is highly adaptable to the market, and the product plan can be adjusted according to demand, making it very competitive in small and medium-sized industrial applications.

Classification:

Complete process

Key words:

Aromatics Production Technology (RHAROM)

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Detailed description

Application areas

The technical raw material can start from benzene, can also start from toluene. When the starting material is benzene, benzene is first alkylated with methanol to produce toluene, toluene is then disproportionated to produce high-concentration crude p-xylene and benzene, benzene is recycled, crude p-xylene is refined by crystallization, and the final products are high-purity p-xylene, mixed xylene and a small amount of C9 aromatic hydrocarbons; when the starting material is toluene, toluene is directly disproportionated to produce crude p-xylene and benzene, the product scheme is high purity p-xylene, benzene, mixed xylene and a small amount of C9 aromatic hydrocarbons.

The technology consists of two parts: benzene and methanol alkylation and toluene shape-selective disproportionation. The configuration of the alkylation and disproportionation sections can be matched according to the scale, or different ratios can be used according to the plant conditions.

Process

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 hydrocarbon reaction, high selective production of toluene, xylene, C9 aromatics, methanol single-pass conversion rate of 100, toluene relative to benzene selectivity of 91-95%, relative to methanol selectivity of 85-90%. The resulting product was separated and purified to yield toluene with a purity of greater than 99.9 percent.

The disproportionation reaction is carried out in a fixed bed reactor. The vaporized toluene enters the bed of the selective disproportionation catalyst, and the toluene is disproportionated to produce benzene and xylene. Due to the shape selectivity of the catalyst, the xylene in the product can break through the equilibrium composition to obtain a high concentration of p-xylene stream, and the selectivity of p-xylene in the xylene stream reaches 90%. The resulting disproportionation product was stably degassed, purified and separated to obtain crude p-xylene with a purity of about 85% and benzene with a purity of 99.9.