阅读说明：本技术 生产脲甲醛浓缩物的方法 (Process for producing urea formaldehyde concentrates ) 是由 M·西姆楞 P·A·韩 C·H·施佩特 于 2020-03-05 设计创作，主要内容包括：凭借自热重整、中间甲醇和氨形成、以及氨至脲产物的转化和甲醇至甲醛的催化氧化,由含烃原料生产甲醇和脲产物的平行联产方法。(A parallel co-production process for producing methanol and urea products from a hydrocarbonaceous feedstock by means of autothermal reforming, intermediate methanol and ammonia formation, and conversion of ammonia to urea products and catalytic oxidation of methanol to formaldehyde.)

1. A process for producing a urea formaldehyde concentrate from a hydrocarbon feedstock comprising the steps of:

(a) producing a synthesis gas comprising hydrogen, carbon monoxide and carbon dioxide by partially combusting the hydrocarbon feedstock and steam reforming in an autothermal reforming stage;

(b) separating the syngas from step into a first syngas and a second syngas;

(c) subjecting the second synthesis gas from step (b) to a high temperature water gas shift conversion and a medium temperature water gas shift conversion in sequence;

(d) removing at least a portion of the carbon dioxide from the second syngas from step (c) to obtain a carbon dioxide-depleted second syngas;

(e) adding nitrogen to the carbon dioxide depleted second synthesis in an amount to obtain a molar ratio of hydrogen to nitrogen of 2.8 to 3.2;

(f) catalytically converting nitrogen and hydrogen in the purified second synthesis gas from step (e) in an inert-free ammonia synthesis stage and withdrawing an effluent comprising ammonia; and

(g) passing at least a portion of the ammonia-containing effluent to a urea synthesis stage and converting the ammonia in the effluent to a urea product by reaction with at least a portion of the carbon dioxide removed from the synthesis gas in step (d),

(h) catalytically converting carbon monoxide, carbon dioxide and hydrogen in the first synthesis gas from step (c) in a single pass methanol synthesis stage and withdrawing an effluent comprising crude methanol and an effluent comprising unconverted first synthesis gas;

(i) recycling the effluent containing unconverted first synthesis gas to the medium-temperature shift conversion in step (c) and/or as fuel to the fired heater and/or to step (e);

(j) subjecting the crude methanol-containing effluent to distillation and extracting purified methanol from the distillation;

(k) oxidizing at least a portion of the purified methanol from step (j) to formaldehyde;

(l) Absorbing the formaldehyde from step (k) in water and an aqueous urea solution prepared from the urea product in step (g) to obtain a urea formaldehyde concentrate.

2. The process of claim 1, wherein nitrogen is added to the carbon dioxide lean second syngas in step (f) via a nitrogen wash.

3. The process of claim 1 or 2, wherein the effluent containing unconverted first synthesis gas is recycled by means of an ejector.

4. A process according to any one of claims 1 to 3, wherein the methanol synthesis stage in step (i) is carried out in at least one methanol reactor containing one or two fixed bed methanol catalysts.

5. The process of any one of claims 1-4, wherein the steam to carbon ratio in the syngas in step (a) is between 0.4 and 1.0.