Dehydration of alcohols on a crystalline silicate of low Si/Al ratio

A process for the dehydration of an alcohol having from 5 to 10 carbon atoms to make the corresponding olefin, comprising:

• introducing in a reactor a stream (A) comprising at least an alcohol having from 5 to 10 carbon atoms, optionally water, optionally an inert component, contacting said stream with a catalyst in said reactor at conditions effective to dehydrate at least a portion of the alcohol to make a corresponding olefin,
• recovering from said reactor an olefin containing stream (B),
• wherein,
• the catalyst is a crystalline silicate of the group FER, MWW, EUO, MFS, ZSM-48, MTT, or TON having Si/Al of at least 20 and under 100,
• or a dealuminated crystalline silicate of the group FER, MWW, EUO, MFS, ZSM-48, MTT, or TON having Si/Al of at least 20 and under 100,
• or a phosphorus modified crystalline silicate of the group FER, MWW, EUO, MFS, ZSM-48, MTT, or TON having Si/Al of at least 20 and under 100,
• and wherein the temperature ranges from 320° C. to 600° C., and wherein the pressure of the reactor ranges from 0.5 to 30 bars absolute (50 kPa to 3 MPa).

A process for the dehydration of an alcohol having at least 4 carbon atoms to make the corresponding olefin, comprising:

• introducing in a reactor a stream (A) comprising at least an alcohol having at least 4 carbon atoms, optionally water, optionally an inert component, contacting said stream with a catalyst in said reactor at conditions effective to dehydrate at least a portion of the alcohol to make a corresponding olefin,
• recovering from said reactor an olefin containing stream (B),
• wherein the catalyst is a phosphorus modified crystalline silicate of the group FER, MWW, EUO, MFS, ZSM-48, MTT, or TON having Si/Al of at least 20 and under 100,
• and wherein the temperature ranges from 320° C. to 600° C. or the WHSV of the alcohol is at least 4 h−1, and wherein the partial pressure of the alcohol in the dehydration reactor ranges from 1.2 to 4 bars absolute (0.12 MPa to 0.4 MPa).