Abstract:

The generation of polymers in butadiene plants is an inevitable challenge in operation. This paper proposes an optimization method to solve the problem of excessive polymers in the circulating solvent of butadiene plants, and proposes a corresponding anti-polymerization scheme for the blockage of reboiler during butadiene production and the expansion and cracking of the gland of reboiler outlet valve due to polymer aggregation. Firstly, the injection points of auxiliary polymerization inhibitor are repositioned to ensure a more uniform distribution of the auxiliary polymerization inhibitor in the circulating acetonitrile solvent, thus achieving the purpose of polymerization inhibition. Secondly, technical transformation is carried out for the valve form of the system by installing flow lines at the valve gland to reduce the dead zone, thus achieving the purposes of reducing polymer generation and ensuring long-term, safe and stable operation of butadiene plants.

Key words: butadiene, acetonitrile, process optimization and transformation, polymerization, blockage