test_string = str('19631 location android location you enter an area enable quick action honeywell singldzone thermostat environment control and monitoring')
print(test_string)

test_string = test_string.replace('singl\dzone ','singl_dbl_zone ')
print(test_string)

19631 location android location you enter an area enable quick action honeywell singldzone thermostat environment control and monitoring
19631 location android location you enter an area enable quick action honeywell singl_dbl_zone thermostat environment control and monitoring

raw_corpus.loc[:,'constructed_recipe']=raw_corpus['constructed_recipe'].str.replace('singl\dzone ','singl_dbl_zone ')

323096  you enter an area android location location environment control and monitoring honeywell singldzone thermostat enable quick action

df['col'] = df['col'].str.replace(r'\d', '_dbl_')

In [165]: df
Out[165]:
  constructed_recipe
0       singldzone

In [166]: df['constructed_recipe'] = df['constructed_recipe'].str.replace(r'\', '')

In [167]: df
Out[167]:
  constructed_recipe
0        singldzone