31. Henri Dreyfus at British Celanese developed a methanol carbonylation pilot plant as early as 1925. 32. The site was used a pilot plant for a new production process using hydrogen sulphide. 33. The Salt Wells Pilot Plant was closed in 1954. 34. The pilot plant came on stream in May 2015. 35. The Agrol pilot plant , which also experienced management and financial difficulties, shut down in 1938. 36. By 1949, the pilot plant employed over 700 people. 37. This concept was then tested in 1976 and a pilot plant constructed at Gulfport, Mississippi. 38. That material, he said, is heading for the Waste Isolation Pilot Plant in New Mexico. 39. The firm recently completed construction of its first pilot plant at The Stanford Research Institute. 40. Libby helped with the engineers from Kellex to produce a workable design for a pilot plant .
