Preparation of urea solution and facility to do so
A urea aqueous solution, urea technology, applied in the preparation of organic compounds, preparation of urea derivatives, sustainable manufacturing/processing, etc., can solve the problems of not allowing multiple pollutants, restricting water sources, etc.
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Embodiment 1
[0117] figure 1 A schematic overview of one arrangement that may be used to practice an embodiment of the invention is provided.
[0118] exist figure 1 , provide CO to the synthesis section 3 2 1 and NH 3 2. The reaction conditions for the formation of crude urea mixture 4 are applied. The crude urea mixture 4 is divided in the condenser belonging to the separation section 23 into a process condensate 6 and a first aqueous urea solution 5 , the typical composition of which is shown in Table 1. The gaseous effluent 20 in the separation section 23 can be fed back to the synthesis section 3 for further reaction.
[0119] The first aqueous urea solution 5 can be further concentrated in a pre-evaporator 15 to obtain a concentrated second aqueous urea solution 14 , whose typical composition is shown in Table 1.
[0120] The process condensate 6 is fed into the first stripper column 7 located above the second stripper column 8 such that the gaseous effluent from the second stri...
Embodiment 3
[0127] figure 2 A practical implementation and implementation of a process condensate treatment plant according to the invention is depicted. At the top of the first desorption column 7 a process condensate 6b and recovered process condensate 6a are provided. The first desorption column 7 is located above the second desorption column 8 such that the gaseous effluent from the second desorption column 8 is fed into the bottom of the first desorption column 7 . Low pressure steam 18 is fed into the bottom of the second desorption column 8 , but no liquid can travel directly from the first desorption column 7 to the second desorption column 8 . The first partially purified stream 9 , 13 leaves the bottom of the first stripper column 7 . Most of the CO present in the process condensate 6 2 and NH 3 It is removed in the first stripper column 7 as shown in Table 1 and exits via the top of the first stripper column 7 as gaseous effluent 21 . The gaseous effluent 21 is fed to a c...
Embodiment 4
[0133] This example provides the relationship between different streams and urea concentrations.
[0134] if:
[0135] - Purified water stream 12 = "A" (expressed in t / h)
[0136] - First partially purified stream 13 = "B" (expressed in t / h)
[0137] - Flow rate of the second concentrated aqueous urea solution 14 = "C" (expressed in t / h)
[0138] - Flow rate of target aqueous urea composition 17 = "D" (expressed in t / h)
[0139] - The weight fraction of urea in the second concentrated aqueous urea solution 14 is "X" (typically 80% by weight, thus a weight fraction of 0.80)
[0140] - The weight fraction of urea in the target aqueous urea solution 17 is "Y" (typically 50% to 52% by weight, therefore 0.52)
[0141] - The ratio between "A" and "B" (fraction of "A" in total A+B) is "Z" (typically 0.40 to 0.60)
[0142] then:
[0143] D=C / X*Y (or, of course: C=D / Y*X)
[0144] A+B=(C*X / Y)*(1-Y)-C*(1-X)
[0145] In addition, A=(A+B)*Z
[0146] Therefore, B=(A+B)*(1-Z)
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