Preventing or reducing fouling in wet-process phosphoric acid production
A wet-process phosphoric acid and fouling technology, applied in the direction of phosphoric acid, phosphorus oxyacid, etc., can solve the problems that are not novel and have been used
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[0090] 1. A method for reducing or preventing fouling in a wet-process phosphoric acid production process, said method comprising:
[0091] Adding an effective amount of one or more scale inhibitors selected from the group consisting of:
[0092] i) phosphonic acid derivatives selected from the group consisting of phenylphosphonic acid, phosphonoacetic acid, hydroxyethylamino-bis(methylenephosphonic acid) (HEMPA) and mixtures thereof;
[0093] ii) Sulfonic acids or corresponding derivatives selected from the group consisting of sulfosuccinic acid, 5-sulfosalicylic acid hydrate, 4-sulfophthalic acid, N-(1,1-dimethyl-2- Hydroxyethyl)-3-amino-2-hydroxypropanesulfonic acid (AMPSO), 3-amino-4-hydroxybenzenesulfonic acid, 1-dodecanesulfonic acid sodium salt, 3-sulfopropyl acrylate potassium salt, 4-Hydroxybenzenesulfonic acid solution, 4,5-dihydroxynaphthalene-2,7-disulfonic acid disodium salt, hydroquinonesulfonic acid potassium salt and their mixtures;
[0094] iii) carboxylic a...
Embodiment 1
[0143] 4 jacketed beakers were placed and clamped on the 4 corners of the hot plate on top of the aluminum pan containing DI water. The beakers were connected in parallel with respect to the water flow from the heating circulator. Phosphoric acid (28% synthetic or crude plant acid sample) was mixed well and then evenly distributed among 4 beakers (450-700 g). The beakers were mixed simultaneously at the same speed with a stir bar. The hot plate was switched on to heat the water bath to a temperature of approximately 90°C. After the mixing in each beaker stabilized, power to the heating circulator was started. When the temperature reading of the circulator was about 50-60°C, the reagents were added to individual beakers (typically three of them, leaving one as a control).
[0144] Then 4 pre-weighed U-tubes connected in series to tap water were submerged into the corresponding beakers. When the circulator reads about 75°C, tap water is turned on to cool the U-tube. The tem...
Embodiment 2
[0161] The test conditions were similar to Example 1, but the concentration of phosphoric acid was increased to 52%. Tests were performed with a pipe temperature of 55°C and an acid temperature of 80°C or with a pipe temperature of 35°C and an acid temperature of 70°C in order to increase the temperature difference to promote fouling. In all tests, 240 rpm to 300 rpm agitation, 1 kg acid and 100 ppm (3 g 3% solution) reagent were used. The duration of the test was between 2 and 6 hours.
[0162] The results are provided in Table E below:
[0163] Table E. Various Reagents at 52% P 2 o 5 The test results under
[0164]
[0165]
[0166] A typical experimental procedure for hydroxypolyethyleneiminosuccinate is as follows: 2 g of disodium cis-epoxysuccinate were synthesized by known procedures and mixed with 8.3 g of 50% polyethyleneimine (PEI) and heated (neat or in CH 3 CN) and stirred at 80 °C for 4 hr. After cooling, the viscous liquid was treated with hexane, af...
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