The sulfur in the biodiesel system includes: mercaptans, sulfides, disulfides, thiophenes, benzothiophenes, dibenzothiophenes, alkyl dibenzothiophenes, etc., which are characterized by diversity and stubbornness. In view of this, the company combines basic research and engineering applications to carry out public relations on major topics. Successfully developed an ultra-low-sulfur methyl ester rectification system with "point cohesion and surface coupling", making the sulfur content of biodiesel as low as 5 ppm.

The system has obtained ultra-low sulfur biodiesel through the strategy of "targeted conversion, dimensionality reduction and removal", and the sulfur content index is in full compliance with EU standards, providing precise assistance for domestic biodiesel exports to the EU. The implementation measures of the system are as follows:

1. Functional cohesion, content coupling

Use the software workstation to perform multi-state simulation, obtain accurate parameters, and develop proprietary tower internals and packings, both soft and hard, to ensure strong protection.

2. Sequential cohesion, control coupling

Multi-dimensional analysis of the physical properties of sulfur and methyl esters, multi-effect balanced distillation, system linkage, and obvious effects.

3. Functional cohesion, marking coupling

The stubborn organic sulfur body is catalyzed to transform the form, and the bottom layer is decomposed, and the effect is immediate. The whole system consists of a rectification tower, and auxiliary facilities such as heat exchangers, tanks, and pumps.