pressure accumulation chamber 30 pressure relief valves 46 47 48 may be provided for safety purposes in connection with the high pressure accumulation chamber 30 receiver vessel 20 and condenser 18 respectively other exemplary embodiment s of the apparatus are shown in fig2 elements shown in fig2 which correspond to the elements described above with respect to fig1 have been designated by corresponding reference numbers the elements of fig2 are designed for use in the same manner as those in fig1 unless otherwise stated with reference to fig2 an alternative carbon dioxide purification and supply apparatus is shown generally at 2 from a bulk supply of liquid carbon dioxide 10 a feed stream 11 comprising carbon dioxide vapor is distilled in a first purification stage and is introduced into a purifying particle filter 13 and a coalescing filter 14 which can be any of a number of known commercially available filters for a second stage purification valves 12 and 15 are provided to isolate the purifying filter s 13 14 the feed stream 11 after having been purified in the second stage is introduced into the receiver vessel 20 that is provided with a heat exchanger 21 to condense the carbon dioxide vapor into a liquid such condensation is effected by an external refrigeration unit 22 that circulates a refrigeration stream through the heat exchanger preferably of shell and tube design isolation valves 28 and 29 can be provided to isolate refrigeration unit 22 and its refrigerant feed line 26 and return line 27 the liquid carbon dioxide is temporarily stored in the receiver vessel 20 that is a low pressure accumulator as may be appreciated since vapor is being condensed within receiver.