Isomerization of trans-1,2-difluoroethylene (HFO-1132(E)) and/or cis-1,2-difluoroethylene (HFO-1132(Z))

An integrated system for the production of HFO-1132(E), the system comprising:

• an electric heater reactor comprising an electric heating element configured to maintain a reactor temperature from about 350° C. to about 600° C. and to heat at least part of a reactant composition to produce a product composition comprising HFO-1132(E);
• and
• a separator fluidly coupled to an outlet of the electric heater reactor and configured to produce a concentrated product composition having a concentration of HFO-1132(E) greater than a concentration of HFO-1132(Z) in the reactant composition.

A method for producing trans-1,2-difluoroethylene (HFO-1132(E)), comprising:

• providing a reactant composition comprising cis-1,2-difluoroethylene (HFO-1132(Z));
• and
• isomerizing the HFO-1132(Z) in a tubular reactor at a temperature of from about 350° C. to about 600° C. to produce a product composition comprising HFO-1132(E).