Preventing or Reducing Scaling in Phosphoric Acid Preparation by Wet Process
A phosphoric acid and wet process technology, applied in phosphoric acid, phosphorus oxyacid, magnesium silicate, etc., can solve the problem of less scaling problem of phosphoric acid equipment
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[0045] CLAIMS 1. A method of preventing or reducing at least one fouling substance in a wet process for the preparation of phosphoric acid, said method comprising:
[0046] One or more steps in the phosphoric acid production process add one or more reagents selected from the following in an amount sufficient to prevent or reduce said fouling:
[0047] i) phosphonic acid derivatives;
[0048] ii) sulfonic acid or corresponding derivatives;
[0049] iii) carboxylic acid derivatives;
[0050] iv) phosphite derivatives; and
[0051] v) a copolymer comprising a second monomer and a first monomer selected from (i)-(iv);
[0052] Provided that the phosphonic acid derivatives are not selected from the group consisting of amino-tris(methylenephosphonic acid) (ATMPA), 1-hydroxyethylidene-1,1-diphosphonic acid (HEDPA), diethylenetri Amine-penta(methylenephosphonic acid) (DTPMP), ethylenediaminemethylenephosphonic acid (EDTMP), hydroxyethylphosphonoacetic acid (HPAA), and phosphonobut...
Embodiment 1
[0098] 4 jacketed beakers were placed and clamped on aluminum pans (on the four corners of the heating plate) filled with DI-water. Connect the beakers in parallel with respect to the water flow from the heating circulator. Phosphoric acid (synthetic or 28% crude plant acid sample) was mixed well and divided equally among 4 beakers (450-700g). Mix the beaker simultaneously at the same speed with a stir bar. Turn on the heating plate to heat the water bath to a temperature of approximately 90 °C. After the mixing in each beaker has stabilized, turn on the power to the heating circulator. When the temperature reading of the circulator was about 50-60°C, reagents were added to each beaker (usually three of them, leaving one as a control).
[0099] Then 4 pre-weighed U-tubes connected in series to tap water were submerged in the corresponding beakers. When the circulator reads about 75°C, turn on the tap water to cool the U-tube. The tap water temperature from the end of the ...
Embodiment 2
[0113] The test conditions were similar to Example 1, but the concentration of phosphoric acid was increased to 52%. In order to increase the temperature difference to increase scale formation, 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 all experiments, 1 kg of acid and 100 ppm (3 g of a 3% solution) of reagent were used with stirring at 240 rpm to 300 rpm. The duration of the test is 2-6 hours.
[0114] The results are shown in Table E below:
[0115] Table E at 52% P 2 o 5 Test results of various reagents
[0116]
[0117] A typical test procedure for hydroxypolyethyleneiminosuccinate is as follows: Synthesize 2 g of cis-epoxysuccinic acid disodium salt according to a known method, mix it with 8.3 g of 50% polyethyleneimine (PEI), heating (neat or in CH 3 CN), and stirred at 80 °C for 4 hr. After cooling, the viscous liquid was treated with hexane, where...
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