Direct Sulfur Recovery

EPA Contract Number: 68D30083
Title: Direct Sulfur Recovery
Investigators: Nelson, Sid
Small Business: Sorbent Technologies Corporation
EPA Contact: Manager, SBIR Program
Phase: II
Project Period: September 1, 1993 through October 1, 1995
Project Amount: $150,000
RFA: Small Business Innovation Research (SBIR) - Phase II (1993) Recipients Lists
Research Category: Air Quality and Air Toxics , SBIR - Air Pollution , Small Business Innovation Research (SBIR)


The objective of the proposed project is to develop and demonstrate a low-cost alternative to a modified Claus plant for conversion of SO2 to elemental sulfur. More specifically, the objectives are to optimize an existing acid-rain sorbent regeneration process developed by Sorbent Technologies Corporation to yield directly a pure elemental sulfur product and to apply the technology to gas streams having a wide range of compositions.

In Phase I, of three strategies examined to increase elemental sulfur yields, one strategy, gas recycling, was observed to be exceptionally effective, yielding 100% conversion of the sulfur released during regeneration to elemental sulfur, with no sulfur species remaining in the exiting gas. Later, an important discovery was made. It was observed that MgO or TiO2 will act as a catalyst for the direct conversion of SO2 to elemental sulfur.

In Phase II, the research in Phase I will be carried forward. The technology will be scaled up to a larger size, evaluated in continuous long-term runs, and optimized.

Supplemental Keywords:

RFA, Scientific Discipline, Air, Toxics, Sustainable Industry/Business, air toxics, cleaner production/pollution prevention, Environmental Chemistry, Sustainable Environment, Chemistry, HAPS, Technology for Sustainable Environment, New/Innovative technologies, Engineering, Engineering, Chemistry, & Physics, Environmental Engineering, sulfur oxides, in-process recycling, desulfurization, cleaner production, control, waste minimization, waste reduction, chemical use efficiency, air pollution control, pollution control technologies, recovery, clean technology, air pollution, Sulfur dioxide, sulfur, sorbent technology, sulfur dioxide (SO2), treatment, SO2, sorbents, pollutants, sulfur recovery, pollution prevention, sulfer oxide, air pollutant precursors, coal fired power plants, air emissions, regeneration, power generation , regenerable sorbent, acid rain sorbent regeneration process, acid rain, Sulfur Oxides (SO2), power generation, gas recycling

Progress and Final Reports:

  • Final