Cyclic 2-stage method for producing vinyl acetate from ethylene
Abstract
Abstract VINYL ACETATE IS PRODUCED BY A CYCLIC METHOD IN WHICH AN ACETIC ACID CATALYST SOLUTION (WORKING SOLUTION) CONTAINING PALLADOUS, ACETATE, CUPRIC AND HALIDE (CHLORIDE OR BROMIDE) IONS IS CYCLED CONTINUOUSLY BETWEEN TWO SEPARATE REACTION STAGES. ETHYLENE IS REACTED WITH THE SOLUTION IN THE FIRST STAGE TO PRODUCE VINYL ACETATE AND PARTIALLY REDUCED CATALYST SOLUTION FROM WHICH THE VINYL ACETATE IS SEPARATED, AND THE PARTIALLY REDUCED SOLUTION IS REACTED WITH MOLECULAR OXYGEN IN THE SECOND STAGE TO REOXIDIZE THE SOLUTION BEFORE IT IS RECYCLED TO THE FIRST STAGE. IN SUCH A METHOD, CUPROUS HALIDE, WHICH IS PRECIPITATED IN THE SOLUTION IN THE FIRST STAGE, FORMS OBJECTIONABLE ADHERENT SOLID DEPOSITS UPON EQUIPMENT SURFACES IN THE FIRST STAGE. IN ACCORDANCE WITH THE INVENTION, SUCH SOLID DEPOSITS ARE PERIODICALLY REMOVED FROM THE FIRST STAGE EQUIPMENT SURFACES BY PERIODICALLY DISCONTINUING THE FEED OF ETHYLENE TO THE FIRST STAGE WHILE CONTINUING THE CYCLING THROUGH THE FIRST STAGE EQUIPMENT OF THE REOXIDIZED CATALYST SOLUTION FROM THE SECOND STAGE.
Inventors
- 👤 William E Hendrix Jr
- 👤 Robert B Miinch
Bibliographic Details
Claims Analysis
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