Method for Producing Hydrocyanic Acid and Device for Producing Hydrocyanic Acid

Abstract

Provided are a method for producing hydrocyanic acid and a device for producing hydrocyanic acid, which can improve a yield of the hydrocyanic acid in a vapor phase contact ammoxidation reaction of methanol. The method for producing hydrocyanic acid includes a step of obtaining hydrocyanic acid by a vapor phase contact ammoxidation reaction by supplying a raw material gas including methanol in a fluidized bed reactor ( 1 ) through a raw material gas disperser ( 7 ) disposed in the fluidized bed reactor ( 1 ) and bringing the methanol into contact with ammonia and oxygen in the presence of a metal oxide catalyst, in which the raw material gas disperser ( 7 ) has one or more pores for releasing the raw material gas into the fluidized bed reactor ( 1 ), and the number of pores per unit cross-sectional area of the fluidized bed reactor ( 1 ) is 10 to 45 pieces/m 2 .

What is claimed is: 
     
         1 . A method for producing hydrocyanic acid, comprising:
 a step of obtaining hydrocyanic acid by a vapor phase contact ammoxidation reaction by supplying a raw material gas containing methanol in a fluidized bed reactor through a raw material gas disperser disposed in the fluidized bed reactor, and bringing the methanol into contact with ammonia and oxygen in the presence of a metal oxide catalyst, wherein the raw material gas disperser has one or more pores for releasing the raw material gas into the fluidized bed reactor, and the number of pores per unit cross-sectional area of the fluidized bed reactor is 10 to 45 pieces/m 2 .   
     
     
         2 . The method for producing hydrocyanic acid according to  claim 1 , wherein the number of pores per unit cross-sectional area of the fluidized bed reactor is 20 to 35 pieces/m 2 . 
     
     
         3 . The method for producing hydrocyanic acid according to  claim 1 , wherein a diameter of the pore is 1 to 12 mm. 
     
     
         4 . The method for producing hydrocyanic acid according to  claim 1 , wherein the raw material gas disperser is a pipe type disperser, a rectifier pipe is attached to the raw material gas disperser at a position having the pore, and the raw material gas released from the pore is supplied into the fluidized bed reactor through the rectifier pipe. 
     
     
         5 . The method for producing hydrocyanic acid according to  claim 1 , wherein the raw material gas contains methanol and ammonia. 
     
     
         6 . The method for producing hydrocyanic acid according to  claim 1 , wherein an oxygen-containing gas is supplied from a bottom of the fluidized bed reactor. 
     
     
         7 . The method for producing hydrocyanic acid according to  claim 1 , wherein the metal oxide catalyst contains at least iron, antimony, phosphorus, and vanadium. 
     
     
         8 . The method for producing hydrocyanic acid according to  claim 7 , wherein the number of moles of vanadium is equal to or more than 0.6 when the number of moles of iron in the metal oxide catalyst is 10. 
     
     
         9 . The method for producing hydrocyanic acid according to  claim 8 , wherein the metal oxide catalyst has a composition represented by the following Formula (I):
   Fe a Sb b P c V d Mo e Cu f W g A h E i G j O k (SiO 2 ) l   (I)
   wherein Fe, Sb, P, V, Mo, Cu, W, O, and Si represent iron, antimony, phosphorus, vanadium, molybdenum, copper, tungsten, oxygen, and silicon, respectively, A represents at least one element selected from the group consisting of Mg, Zn, La, Ce, Al, Cr, Mn, Co, Ni, Bi, U, and Sn, E represents at least one element selected from the group consisting of B and Te, G represents at least one element selected from the group consisting of Li, Na, K, Rb, Cs, Ca, and Ba, subscripts a, b, c, d, e, f, g, h, i, j, k and l represent atomic ratios, and when a=10 is assumed, b=12 to 30, c=1 to 30, d=0.6 to 3, e=0 to 0.3, f=0 to 5, g=0 to 3, h=0 to 6, i=0 to 5, j=0 to 3, l=0 to 200, and k is an oxygen atomic ratio required to satisfy the atomic valence of each of the elements excluding silicon.   
     
     
         10 . The method for producing hydrocyanic acid according to  claim 1 , wherein the metal oxide catalyst contains at least molybdenum and bismuth. 
     
     
         11 . The method for producing hydrocyanic acid according to  claim 10 , wherein the metal oxide catalyst has a composition represented by the following Formula (II):
   Mo m Bi n Fe o J p L q M r Q s O t (SiO 2 ) u   (II)
   
       wherein Mo, Bi, Fe, O, and Si represent molybdenum, bismuth, iron, oxygen, and silicon, respectively, J represents at least one element selected from the group consisting of Ni, Co, Zn, Mg, Mn, and Cu, L represents at least one element selected from the group consisting of La, Ce, Pr, Nd and Sm, M represents at least one element selected from the group consisting of Li, Na, K, Rb, and Cs, Q represents at least one element selected from the group consisting of Ca, Sr, Ba, Cd, Ti, Zr, V, Nb, Ta, Cr, W, Ge, Sn, Y, Al, Ga, Ru, Rh, Pd, Re, Os, Ir, Pt, Ag, B, P, Sb, and Te, subscripts m, n, o, p, q, r, s, t, u represent atomic ratios, and when m=12 is assumed, n=0.1 to 5, o=0.1 to 10, p=2 to 12, q=0.01 to 5, r=0.01 to 2, s=0 to 10, u=20 to 200, and t is an oxygen atomic ratio required to satisfy the atomic valence of each of the elements excluding silicon. 
     
     
         12 . The method for producing hydrocyanic acid according to  claim 1 , wherein the methanol is brought into contact with ammonia and oxygen at a temperature of 300° C. to 500° C. 
     
     
         13 . The method for producing hydrocyanic acid according to  claim 1 , wherein the methanol is brought into contact with ammonia and oxygen at a pressure of 0 to 200 kPa (gauge pressure). 
     
     
         14 . A device for producing hydrocyanic acid by a vapor phase contact ammoxidation reaction by bringing methanol into contact with ammonia and oxygen in the presence of a metal oxide catalyst, the device comprising:
 a fluidized bed reactor configured to accommodate the metal oxide catalyst and to perform the vapor phase contact ammoxidation reaction,   one or more raw material gas dispersers disposed in the fluidized bed reactor, and   a raw material gas supply unit configured to supply a raw material gas containing methanol to the raw material gas disperser,   wherein the raw material gas disperser has one or more pores for releasing the raw material gas into the fluidized bed reactor, and the number of pores per unit cross-sectional area of the fluidized bed reactor is 10 to 45 pieces/m 2 .   
     
     
         15 . The device for producing hydrocyanic acid according to  claim 14 , wherein the raw material gas contains methanol and ammonia. 
     
     
         16 . The device for producing hydrocyanic acid according to  claim 14 , the device further comprising:
 an oxygen-containing gas supply unit configured to supply an oxygen-containing gas from a bottom of the fluidized bed reactor.