Device for preparing isocyanate by pyrolyzing aminoalkyl esters

The invention belongs to the technical field of organic chemical industry production, and relates to a device for preparing isocyanate by pyrolyzing aminoalkyl esters. A major structure comprises a pyrolysis reaction kettle, three tower columns, two H distilling heads and three receiving pots; the top part of the pyrolysis reaction kettle is communicated with the bottom of sieve plate tower columns by a tower body support; the top part of a lower sieve plate tower column is communicated with the bottom of an oblique H distilling head; the top part of the oblique H distilling head is connectedwith the bottom of a middle packing tower column; an outlet of the oblique H distilling head is respectively communicated with a product receiving pot; the top end of the middle packing tower column is communicated with the bottom end of a horizontal H distilling head; the top part of the horizontal H distilling head is communicated with the bottom of an upper packing tower column; an outlet of the horizontal H distilling