By B M Andreev; et al
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Additional resources for Separation of isotopes of biogenic elements
132 . This value, according to eq. qxd 11/3/2006 10:15 AM 46 0 Page 46 2. 042. 044 which approaches the above value. Within the temperature range from 0 to 20°C, the NH3–ND3 vapor pressure ratio varies 3 0 0 from 1. 07503 to 1. 019. 2 indicates, experimental data of different authors vary noticeably. Since the data of the French researchers  are interposed between the data reported in sources [14, 16], they can be used in calculations as more reliable. Considering that the ammonia rectification requires lower-grade heat than water vacuum rectification, these two rectification processes can be combined into a multiple-unit rectification scheme where water vacuum rectification exhaust gas is utilized for heating the ammonia column evaporator.
79) have been derived in reference , where eq. 54) at λ ϭ const was used for the maximum extraction degree. As a consequence, in the NTP calculation by eq. 78), first the θ value is specified, and K′ is determined from eq. 65); then the value of flow ratio λ is derived from eq. 66). When using eq. 79), the K ′ value is also determined from eq. 65), where by the separation degree is meant not the column K separation degree appearing in eq. e. 11 KΣ ϭ x〉 /x BI). For the depletion column the following expression was obtained : nD ϭ ln[ K D (1Ϫ )] .
The holdup affects the hydraulic resistance and the target concentration achievement time (see above). The holdup is the liquid amount on the packing bed falling at the packing unit volume, and most commonly expressed in m3/m3. In the packed columns, the total holdup is formed with static holdup ΔHS and dynamic holdup ΔHD: H ϭ HS ϩ H D . 111) By the holdup is meant a liquid amount held on the packing by capillary forces. The holdup dynamic component results from the liquid amount moving along the packing with gas (vapor) flow.
Separation of isotopes of biogenic elements by B M Andreev; et al