Refined wax equipment

refined wax equipment

Composition characteristics of refined wax equipment

The refined wax equipment consists of five units, namely crystallization unit; dewaxing section filtration, deoiling first-stage filtration, deoiling second-stage filtration unit; filtrate, wax liquid, and oil solvent recovery and drying dehydration unit under wax; ammonia refrigeration unit; Vacuum sealed unit.

The device's dewaxing and deoiling solvent uses methyl ethyl ketone and toluene binary solvents.

The 400,000 t/a refined wax equipment uses the third-line distillate oil from the 8 million t/a distillation unit as raw material, and is processed to produce 54# or 56# paraffin products. The crude oil is a mixture of Shenbei crude oil and Daqing crude oil in a certain proportion.

In order to increase the yield of deoiled wax, the device first determined an adjustment direction, which is to use the remaining refrigeration capacity after the device does not control the freezing point of the dewaxed oil, and transfer the cooling capacity to reduce the filtration of the feed to the first and second deoiling stages. temperature to reduce the loss of low melting point paraffin components in the raw materials;

Solvent dewaxing also utilizes the influence of the solvent composition on the crystallization state of the wax to control the optimal ratio to achieve a better crystallization state of the wax. The solvent composition is thus adjusted so that the solvent composition is conducive to both increasing the wax yield and helping the product wax oil content to meet the standard.

During the adjustment process of the device, in order to reduce the filtration temperature of the first and second deoiling stages, taking into account the fact that the solvent used in the dewaxing stage of the device has a large refrigeration capacity while the solvent used in the first and second deoiling stages has a small refrigeration capacity, in order to make full use of Due to the excess refrigeration capacity of the dewaxing section, the device was adaptively modified and a pipeline was added to replace all the cold washing solvents in the dewaxing section with low-temperature solvents in the dewaxing section. The refrigeration capacity of the dewaxing section was transferred to part of the dewaxing section. Reduce the filtration temperature of the deoiling section.