Hi,
by default ethylene-glycol is created in centrifugal-pan-mk01
and the recipe contains 3 fluids, and the centrifugal-pan-mk01 structure has only 2 inputs judging by the prototype.
If I remove at least one liquid from the recipe, then ethylene-glycol can be created.

RECIPE {
type = "recipe",
name = "ethylene-glycol",
category = "pan", --pyro scrubber
enabled = false,
energy_required = 4,
ingredients = {
{type = "fluid", name = "slacked-lime", amount = 20},
{type = "fluid", name = "chloroethanol", amount = 100},
{type = "fluid", name = "water", amount = 100},
{type = "item", name = "pure-sand", amount = 5}
},
results = {
{type = "fluid", name = "ethylene-glycol", amount = 150},
},
main_product = "ethylene-glycol",
subgroup = "py-petroleum-handling-fluids",
order = "a"
}:add_unlock("petroleum-gas-mk02"):change_category("scrubber")

centrifugal-pan-mk01 prototype:
fluid_boxes = {
{
production_type = "input",
pipe_picture = DATA.Pipes.pictures("assembling-machine-2", {2.5, 5.3}, {-1.5, -5.7}, {5.5, -2.5}, {-5.5, 2.4}, pipe_left),
pipe_covers = DATA.Pipes.covers(false, true, true, true),
base_area = 10,
base_level = -1,
pipe_connections = {{type = "input", position = {-2.5, -5.5}}}
},
{
production_type = "output",
pipe_covers = DATA.Pipes.covers(false, true, true, true),
base_level = 1,
pipe_picture = DATA.Pipes.pictures("assembling-machine-2", {2.5, 5.3}, {-1.5, -5.7}, {5.5, -2.5}, {-5.5, 2.4}, pipe_left),
pipe_connections = {{type = "output", position = {2.5, 5.5}}}
},
{
production_type = "input",
pipe_picture = DATA.Pipes.pictures("assembling-machine-2", nil, {2.5, -5.7}, {5.5, 2.5}, {-5.5, -2.5}, pipe_right),
pipe_covers = DATA.Pipes.covers(false, true, true, true),
base_area = 10,
base_level = -1,
pipe_connections = {{type = "input", position = {2.5, -5.5}}}
},
{
production_type = "output",
pipe_covers = DATA.Pipes.covers(false, true, true, true),
base_level = 1,
pipe_picture = DATA.Pipes.pictures("assembling-machine-2", nil, {2.5, -5.7}, {5.5, 2.5}, {-5.5, -2.5}, pipe_right),
pipe_connections = {{type = "output", position = {-2.5, 5.5}}}
},

Bobs+Angels+pycoalprocessing+pypetroleumhandling+pyfusionenergy