Method of manufacture of separation membrane structure

A method of manufacturing a separation membrane structure comprising steps of

• measuring a permeation rate of a predetermined gas in a porous substrate,
• forming a first zeolite membrane on a surface of the substrate by hydrothermal synthesis using zeolite seed crystals,
• measuring a permeation rate of the predetermined gas in the substrate after formation of the first zeolite membrane, and
• forming a second to nth zeolite membranes on the first zeolite membrane by hydrothermal synthesis to satisfy Formula (1) below,
• (Formula 1)
• N1/N0+0.1T2−n/T1≤2N1/N0+2 (1)
• wherein, n is an integer greater than or equal to 2, N1 denotes a permeation rate of a predetermined gas in the substrate after formation of the first zeolite membrane, N0 denotes a permeation rate of a predetermined gas in the substrate before formation of the first zeolite membrane, T1 is a time required for formation of the first zeolite membrane, and T2−n is a total time required for formation of the second to the nth zeolite membranes.