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Having a long tradition in organosulfur chemistry, Robinson Brothers are uniquely equipped for the manufacture and application of organosulfur chemicals. From early beginnings in the manufacture of Mercaptocarboxylic acids e.g. Thioglycolic acid and gas odorising materials e.g. tetrahydrothiophene by way of Hydrogen sulfide chemistries; our knowledge base has expanded over many years to include numerous examples of thiolations for the preparation of alkyl and aryl mercaptans and thiols (R-SH).

Manufacturing capability:

Operating at every scale from 100grams to large tonnes (10-100t). We are able to use and apply a wide variety of thiolating agents, which include but are not limited to:-

  • Hydrogen sulfide (H2S)
  • Sulfur chlorides: S2Cl2, SO2Cl2, SOCl2
  • Sodium sulfide (NaS) and Sodium hydrogen sulfide (NaSH)
  • Phosphorous pentasulphide (P2S5)
  • Lawessons reagent (2,4-bis(4-methoxyphenyl)-1,3,2,4-dithiadiphosphetane-2,4-disulfide), both manufacture and use of same
  • Thioacetic acid (CH3COSH)
  • Potassium thioacetate (CH3COSK), both manufacture and use of same
  • Sodium ethylxanthate (C2H5C(=S)SNa) and Potassium ethylxanthate (C2H5C(=S)SK), both manufacture and use of same

Key technologies:

  • Our ability to handle high odorous (stench) materials under strictly controlled and contained conditions, protecting the environment, our workforce, our neighbouring community, and the avoidance of nuisance odors, is of paramount importance to us. To support this activity, we have continued to invest heavily in containment systems and abatement facilities including thermal oxidation and bespoke flue gas scrubbing systems
  • Flexible arrays of multi-purpose reactors along with their associated ancillary equipment, vacuum pumps, gauge tanks, filter driers etc. are each capable of being vented under negative pressure to the thermal oxidiser and abatement plant. Final product isolation is conducted in segregated solids handling facilities – typically having Rosenmund Guedu enclosed filter driers and final product packing area’s equipped with laminar flow booths

Typical transformations: