Assertion: dilute phosphoric acid | /r/MadeOf | about 30 weight percent
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Source sentences:
text: A process for producing concentrated phosphoric acid containing about 50 weight percent P 0 comprising the steps of digesting crude phosphate rock with sulphuric acid of about 70 weight percent H 50 to obtain dilute phosphoric acid containing about 30 weight percent P 0 vaporizing steam from said dilute phosphoric acid 'by indirect heat exchange with hot sulphuric acid in an evaporation zone which is maintained under vacuum to form a mixture of steam and concentrated phosphoric acid containing about 50 weight percent P 0 separating said steam from said concentrated phosphoric acid, withdrawing said concentrated phosphoric acid as a product of the process, introducing the separated steam into a liquid-gas contact zone under vacuum, introducing into said contact zone sulphuric acid from said evaporation zone, absorbing the steam into said sulphuric acid in said contact zone to dilute said sulphuric acid to a concentration of about 70 weight percent H 80 thereby heating the sulphuric acid, separating the sulphuric acid of about 70 weight percent H 50 into two streams, recycling one of said streams to the digesting step, mixing the other of said streams with fresh concentrated sulphuric acid, and passing the resulting sulphuric acid to said evaporation zone to concentrate additional phosphoric acid.